A two-way inclined ship lift comprises a retaining dam and track sections having certain gradients relative to upstream and downstream water levels of the retaining dam, wherein the track sections and a dam body are connected through a connecting section adopting a reinforced concrete structure, ship chambers are arranged at the track sections, positioning holes are formed in the ship chambers, ships can be connected with chamber bodies through ropes, an upstream side chamber door and a downstream side chamber door which can be opened outwards are arranged at upstream and downstream ends of each ship chamber respectively, limiting pulleys are mounted at bottoms of the ship chambers, limiting pull rings are arranged on upstream sides of the ship chambers, the ship chambers can be connected with the dam body through safety ropes, a cavity is formed in the connecting section, a guide pulley block is mounted in the cavity and matched with the ship chambers through a wire rope penetrating through a reserved hole of the connecting section, and ascending and descending of the ship chambers are realized. The two-way inclined ship lift has the effects that the inclined ship lift is based on a small low-flow river channel, the dam passing requirement of small ships such as small boats, bamboo rafts, drift ships and the like can be met, the project investment is effectively reduced, manpower and electric power are saved, and the dam passing efficiency of the ships is improved.