The invention relates to a double-stick type lockpin which is mainly composed of two pin sticks and a check block. The check block is arranged on one pin stick, and the two pin sticks are hinged to each other. Chain rings are arranged at the hinge ends of the two pin sticks respectively, and the two chain rings are connected together. The check block is arranged on the end portion of the pin stick. The check block and the pin sticks are integrally formed. Due to the fact that a double-stick type lockpin structure is adopted, the double-stick type lockpin has the advantages of being simple in structure, reasonable in design, capable of achieving locking limit of devices, convenient for divers to mount and dismount underwater and easy and convenient to operate, and solves the problems that mounting is inconvenient and limit locking is out of operation underwater due to water flow, device vibration and the like. The double-stick type lockpin is made of stainless steel materials, and further has the performance of being reliable in locking performance, not prone to rusting and capable of being repeatedly used.