The utility model relates to a sectional type refueling pool sluice gate for a nuclear power plant. The device comprises an upper segment, a middle segment and a lower segment, a connecting sealing gasket is arranged between every two adjacent sections; the bolt is connected with the nut; two lifting lugs are arranged at the top of the upper section; a rope tying ring is arranged on the side surface of the upper section; two guide pins are arranged at the tops of the middle section and the lower section; holes are formed in the bottom of the upper section and the bottom of the middle section,the hole in each section corresponds to the guide pin on the adjacent section, pressing strip assemblies are arranged on the side faces of the upper section, the middle section and the lower section,each pressing strip assembly comprises a plurality of pressing strips, and an inflation sealing assembly is arranged between every two adjacent pressing strips. According to the utility model, the problem that the size of an in-out containment is limited is solved, and the process requirement that the refueling pool sluice gate is assembled in a shell and stored outside the shell can be met; and the good sealing performance reduces the risk of excessive irradiation to maintainers.