The utility model relates to a water-delivery valve opening detection device of a chain-transmission-type ship lock. The water-delivery valve opening detection device of the chain-transmission-type ship lock comprises a chain wheel support, wherein the chain wheel support is provided with a chain wheel and a rotary coder; the chain wheel is connected with the rotary coder through an elastic coupler; a chain is loaded on the chain wheel; two ends of the chain vertically penetrate through the chain wheel support; one end of the chain is connected with a balancing weight; the other end of the chain is fixedly connected with a traction bracket; a travel limit switch is arranged below the chain wheel support and on one side of the chain; and an induction polar plate is mounted on the chain. According to the water-delivery valve opening detection device of the chain-transmission-type ship lock, the vertical linear motion of the valve is converted into rotary motion by using a chain drive technique to drive the rotary coder to rotate, so that the valve opening can be detected. The device is simple in structure and reliable in operation.