Impact generator for generating high-frequency low-amplitude energy

The invention provides an impact generator for generating high-frequency low-amplitude energy. The impact generator comprises a main shaft and a shell coaxially sleeved on the outer side of the main shaft, wherein a motor assembly is arranged in the shell, and the motor assembly is connected with the top of the main shaft and drives the main shaft to rotate under the action of drilling fluid; an impact portion cavity is formed between an inner wall of the shell and an outer wall of the spindle, an elastic telescopic piece and an impact portion are arranged in the impact portion cavity, the top of the elastic telescopic piece is fixed, the bottom of the elastic telescopic piece is connected with the top of the impact portion, a positioning piece is arranged on the impact portion, and a Z-shaped ratchet groove matched with the positioning piece is formed in the outer wall of the spindle; when the positioning piece is located at the lowest position of the ratchet groove, the bottom of the shell abuts against the