Abstract: In order to realize automatic cleaning of tail pulley in belt conveyor,to improve mechanized degree of fully- mechanized gateway driving face and to reach th e target of safety and sequence production with manpower reduced and efficiency improved, the paper analyzed the causes of silt accumulation and throwing objects occurr ed at the tail pulley of belt conveyor in mine fully- mechanized driving face,pointed out safety hidden dangers existed. provided the solution idea of belt silt clean device an d stated the working principle of belt silt cleaning device. The related design calculation and the motor selection were conducted according to the certain mode tail pulley of belt conveyor. A structure design of the silt cleaning device was conducted and the structure features were stated. A prototype of silt cleaning device was processed and m anufactured. The surface and underground mine tests showed that the siet cleaning device reached expected functions and could provide effective solution to clean the silt accumulation and throwing objects at the tail pulley of belt conveyor.