Abstract: The safety of geotechnical engineering in the cold zone environment is highly dependent on the stability of the supporting structure. Wet-sprayed concrete has been gradually applied to the support of roadways with broken peripheral rocks because of its advantages of low rebound and the high strength of the sprayed layer. However, the influence of the temperature effect is not fully considered in current engineering practice. In order to explore the influence of temperature on the evolution of the strength of the wet-sprayed concrete spray layer in the roadway support of mines in cold areas, the evolution of the strength of the wet-sprayed concrete spray layer in a mine in a cold environment. For the cold environment of a mine wet spray concrete technology application process, spray layer thickness is small, low strength, easy to crack, and other phenomena, respectively, to carry out the temperature on the wet spray concrete spray layer strength development factors. Scanning electron microscope observation was used to analyze the micro-structure of wet-sprayed concrete hardened slurry. As well as the application of XRD to analyze the hydration reaction products of wet-sprayed concrete at different temperatures and ages. It was found that the strength evolution of the spray layer of wet sprayed concrete roadway support in a cold area has an obvious temperature effect. In the temperature range of 0 ～ 20 °C, when the curing temperature is lower than 10 °C, the compressive strength of the spray layer develops faster with the increase in temperature. Especially when the temperature is low (0 ℃ or so) to observe the micro-structure of the surface of the loose porous pore, cracks more; When the maintenance temperature is higher than 15 ℃, the development of spray layer compressive strength slows down with the increase in temperature, but the micro-structure is gradually dense and the structure is more compact. The temperature affects the hydration reaction of wet-sprayed concrete through the influence of the micro-structure, the initial pore cleavage in the micro-structure of the wet-sprayed concrete and the interface strength of the transition zone of the aggregate, which directly affects the macroscopic mechanical properties of wet-sprayed concrete. According to the results of indoor experiments and the effectiveness of field engineering application, the optimization measures for wet-sprayed concrete support in a cold environment are proposed, which can effectively improve the strength of the sprayed layer structure. The engineering application shows that the strength of the sprayed layer of wet-sprayed concrete in 28 days after the improvement is increased from 19.5 MPa to 32.9 MPa, which is improved by about 40%, the surface of the sprayed layer is dense and smooth, and the production capacity of the sprayed layer of wet-sprayed concrete is increased by about 25%. The research conducted favorable outcomes in construction and served as an example for the implementation of wet-sprayed concrete in projects involving comparable engineering conditions.