A shelter water supply system is arranged on the rear wall of the shelter, the water supply system includes a rotating door, a first disc, a second disc, a corner joint, a flap, a limit seat, and a filling joint; The first disc includes a snap ring, an avoidance cavity, a first piston, a second piston, a first post, a second post, a first spring, and a second spring; the second disc includes a through hole, a downstream surface, Upstream surface, sealing strip, limit hole; the filling joint includes main body of filling joint, faucet, constriction part, stop ring, injection chamber, passage chamber, faucet chamber, first stop surface, second stop surface.