The utility model provides a belt conveyor speed sensor, including the fixed plate, a supporting plate, bearing roller and photoelectricity tacho sensor, both ends below the fixed plate are equipped with the backup pad respectively, be equipped with the bearing roller between two backup pads, be equipped with a plurality of reflection of light pieces on the barrel face of bearing roller, be equipped with photoelectricity tacho sensor below the fixed plate, the lower extreme of every backup pad, the upper and lower both ends that also are the bearing roller axle are equipped with connect the via hole respectively, be equipped with the connecting rod in the connect the via hole, the epaxial side's of bearing roller connecting rod is equipped with scouring sponge, the connecting rod of bearing roller axle below is equipped with the brush board, the upper end of every backup pad is equipped with the through -hole respectively, be equipped with the dead lever in the through -hole, the one end of dead lever is equipped with the oil storage tank, it leads oil pipe to be connected with below the oil storage tank, the lower extreme of leading oil pipe is equipped with the control valve. A belt conveyor speed sensor, reasonable in design, simple structure, the maintenance of being convenient for, the incidence of reduction accident reduces transportation equipment's maintenance cost, promotes staff's work efficiency.