The invention provides a material blocking detection and control device for a belt conveyor. The material blocking detection and control device for the belt conveyor comprises a support and a PLC (Programmable Logic Controller) and is characterized in that the lower portion of the support is provided with a detection unit, the detection unit comprises a supporting rod, a material blocking block and a switch baffle-board, the supporting frame is fixed at the lower portion of the support and can rotate around the support, the material blocking block is fixed at one end of the supporting rod, the switch baffle-board is fixed at the other end of the supporting rod, a proximity sensor which is matched with the switch baffle-board is fixed on the support, and the proximity sensor is connected with the PLC. The material blocking detection and control device for the belt conveyor is arranged at the tail end of the belt conveyor and at the front end of a discharging barrel, is simple in structure, convenient to maintain, accurate and reliable, can detect the material blocking quickly, is very quick in operation and can find the material blocking of the belt conveyor timely and effectively, thereby avoiding accidents.