The invention discloses a hydroelectric power station tail water temporary gate water transportation method, which comprises the steps of door lifting decomposition, manufacture of a large sliding frame, gate shipping transportation, gate unshipping and the like. The hydroelectric power station tail water temporary gate water transportation method adopts an inlet access door to assemble a set of tail gas temporary sealing doors, and after mounting of a machine set, a tail water temporary gate is simply, quickly and conveniently transported to an inlet access door groove to be mounted, thereby resolving the problem that a hydroelectric power station tail water platform and areas around the hydroelectric power station tail water platform are impassable for vehicles so that transportation is inconvenient. Simultaneously, independent manufacture of stop log gates for sealing of tail water is avoided, thereby saving investment for the hydroelectric power station.