High-speed reducer for fan

The utility model discloses a high-speed reducer for a fan, which comprises a heat dissipation module and a power module, the heat dissipation module comprises a machine body, two limiting rings installed in the machine body, C-shaped gear rings movably connected to the outer sides of the limiting rings in a sleeving mode, a plurality of curved pipes transversely penetrating through the C-shaped gear rings, a metal pipe connected between the two curved pipes and a water tank movably connected to the outer sides of the limiting rings in a sleeving mode and connected with the C-shaped gear rings. And the curved pipe is connected and communicated with the water tank. According to the utility model, the output shaft of the motor is set to rotate clockwise and anticlockwise in a reciprocating manner, the rotation amplitude is less than 60 degrees, then the motor is communicated with an external power supply, then the motor drives the C-shaped gear ring to rotate through the gear, then the C-shaped gear ring drives