Speed reducer with heating function

The utility model relates to a speed reducer with a heating function, which comprises a casing, an input shaft, a transmission component and an output shaft, the input shaft and the output shaft are both rotatably mounted on the casing, the transmission component is linked with the input shaft and the output shaft, a mounting cavity is arranged in the casing, and the speed reducer comprises a heating component. The transmission assembly comprises a first shaft gear, a transmission shaft, a first gear, a second shaft gear and a second gear, the first shaft gear is meshed with the first gear, the second shaft gear is meshed with the second gear, the heating assembly comprises a mounting seat and a heating rod, the mounting seat is detachably connected with the shell, the heating rod is located on the mounting seat, and the heating rod comprises a fixing plate; an oil injection cavity is formed in the mounting base, the fixing plate is detachably connected with the mounting base, a plurality of oil injection hol