The invention relates to a friction mechanism of a clock. The friction mechanism of the clock comprises a cannon pinion kit and a cannon pinion piece, wherein the cannon pinion kit comprises a cannon pinion shaft and a cannon pinion shaft tooth sleeved on the cannon pinion shaft; the cannon pinion shaft tooth and the cannon pinion shaft are rotated synchronously; the cannon pinion piece is sleeved on the cannon pinion shaft; and an elastic device is arranged between the cannon pinion piece and the cannon pinion shaft tooth or between the cannon pinion piece and the cannon pinion shaft, and has acting force on the cannon pinion piece and the cannon pinion kit. According to the friction mechanism of the clock, the deformation of an elastic part is fully utilized to generate elasticity to control force of friction, and the force of friction is not controlled by the size accuracy of the part alone, so that the processing difficulty of the part is reduced, the timing and the travel time of the clock can be improved by utilizing cannon pinion friction type timing, a mechanism of the clock is simplified, the production difficulty is reduced, and the production cost is effectively saved.