Speed change mechanism of snowmobile

The utility model relates to a speed change mechanism of a snowmobile, and belongs to the field of snowmobile. Comprising a gearbox, the gearbox bears a control assembly, an input assembly, a driven assembly and an output assembly, the input assembly, the driven assembly and the output assembly are connected in a matched mode, and the control assembly is matched with the input assembly. The input assembly comprises an input shaft, one end of the input shaft penetrates through the box body, the penetrating end is connected with the power device, the other end of the input shaft is connected with the box cover in a matched mode, a sliding gear capable of relatively sliding along the input shaft is sleeved outside the input shaft close to the box cover, the input shaft close to the box body is rotatably connected with an input wheel, and the sliding gear is connected with the input wheel in a matched mode. The gear shifting process is convenient to operate, the internal structure is simple and rapid to change, t