The utility model relates to a boiler equipment technical field especially relates to a boiler speed reducer, which comprises a housin, including a motor, an end cap, a controller, and a cover plate, transmission and induction system, the motor sets up in the casing, transmission is connected with the motor, induction system and transmission are connected, be equipped with oil reservoirs and output shaft on the casing, be equipped with oil -out and oil inlet on the oil reservoirs, the last input tube that is connected with of oil inlet, induction system includes first sensor and second sensor, the first sensor is connected with transmission, the second sensor is connected with oil reservoirs, transmission includes the shaft coupling, transmission shaft and gear, the output shaft passes through the shaft coupling and is connected with the transmission shaft, transmission shaft and gear connection. This speed reducer need not staff operation, can be automatically adds proper amount lubricating oil to the drive disk assembly of speed reducer, need not consuming time, thoroughly lubricated, simple structure, the practicality is strong.