The invention discloses an all-lock chamber water conveyance system capable of adapting to a large-scale high head ship lock. The all-lock chamber water conveyance system comprises a lock chamber, main galleries at two sides, a first diversion port, a middle branch gallery, second diversion ports, a water outlet branch gallery and an energy dissipation cover plate, wherein the first diversion port is positioned in the middle of the lock chamber, comprises two inlets and two outlets, and adopts a three-dimensional diversion model; the second diversion ports are positioned on parts at 1/4 and 3/4 of the length of the lock chamber; each second diversion port comprises an inlet and four outlets, and adopts a large-cavity self-diversion structure; the vertical surfaces of the branch galleries are trapezoidal; when water is positively filled, a flow direction of water flow is reduced along the way; water outlets are uniformly distributed in the tops of branch galleries; and the energy dissipation cover plate is adopted on the tops of the water outlets for energy dissipation. According to the all-lock chamber water conveyance system, longitudinal and transverse flow of water flow in a water conveyance process of a ship lock chamber can be reduced, mooring conditions of ships in the lock chamber are improved, the lockage safety of the ships is improved, the water conveyance efficiency of the lock chamber is improved, and the passenger and freight volume of the lock chamber is increased; and by simplifying the body forms of the second diversion ports of the lock chamber, a cavitation and cavitation erosion problem which is liable to appear because of too complex body forms of the second diversion ports is avoided.