Chuck connecting structure and underwater multi-path quick-plug connector

The invention relates to the technical field of underwater hydraulic system butt joint, and provides a chuck connecting structure and an underwater multi-path quick-plug connector. The clamping head connecting structure comprises a locking male head, the locking male head comprises a center shaft, at least three clamping jaws are evenly distributed at one end of the center shaft in the circumferential direction, male head contact faces are symmetrically arranged on the two sides of each clamping jaw, and the included angle between the adjacent male head contact faces between the adjacent clamping jaws ranges from 105 degrees to 115 degrees. The locking female head comprises a fixing seat, a plurality of clamping grooves are formed in the fixing seat, and female head contact surfaces are symmetrically arranged on the two sides of the clamping grooves; in the first connection state, in the clamping jaw and the clamping groove which are matched with each other, a gap of 5-8 mm is formed between the male contact