The invention discloses a boiler slag waste heat recovery and utilization system. The boiler slag waste heat recovery and utilization system comprises a base, a first support seat and a second support, wherein the first support seat and the second support seat are fixedly connected to the upper end of the base, a first belt pulley and a second belt pulley are rotatably connected to the side wallsof the first support seat and the second support seat respectively, the first belt pulley is in driving connection with the second belt pulley by virtue of a conveying belt, a mechanism groove is formed in the second support seat, a first gear and a second gear which are engaged with each other are rotatably connected to the inner wall of the mechanism groove, the second gear is coaxially and fixedly connected with the second belt pulley by virtue of a first rotating shaft, and a driving device which is used for driving the first gear to rotate is installed on the side wall of the second support seat. According to the boiler slag waste heat recovery and utilization system, the whole device is driven to operate by magnetic force through connection and disconnection of an electromagnet, theconveying belt is operated under the linkage of the two gears, so that slag can be continuously conveyed, manual operation is not needed, manpower is saved, and compared with a motor driving mode, electric power is saved.