A lap joint platform of a large-load lifting container, comprising a machine frame (18), a rocker arm platform (14), a rear rocker arm platform (17), a locking device and lifting devices. The rocker arm platform (14) is hinged with the top of the machine frame (18) through a shaft set (15) and is provided with mine car rails (24) and a rubber-tired vehicle support face (26). The rear rocker arm platform (17) is fixed with the top of the machine frame (18) through bolts. The locking device is arranged below the rocker arm platform (14) and comprises a locking lower sliding block cover plate (7), a locking lower sliding block (9), a locking upper sliding block (10), a locking oil cylinder front support (11), a locking lower sliding block guide rail (12), a locking inclined rail (13) and a locking oil cylinder (16). The lifting device is arranged below the locking device and comprises a connecting rod lower support (1), a support pawl connecting rod (2), a support pawl push rod (3), a support pawl (5), a support pawl rear end (6), a support oil cylinder rear base (19), a support oil cylinder (20), an anti-collision rear buffer base (21), an anti-collision buffer (22) and a support guide block (23). The lap joint platform is stable in the loading and unloading process, simple to operate and large in steel wire rope compensation height.