The utility model discloses a transformer station metering secondary circuit terminal sealing device comprising a pedestal and a shield, the outer bottom wall of the pedestal is provided with a clamping groove, the bottom is internally provided with a slide rail, and the upper surfaces of the two side walls of the pedestal are provided with pedestal connecting holes; protective cover connecting holes are formed in the portions, corresponding to the base connecting holes, of the two sides of the protective cover, and the base and the protective cover are connected and fixed through screws via the base connecting holes and the protective cover connecting holes. The device is simple and practical, is convenient to install and disassemble, and effectively solves a problem of metering errors orrisks of electricity stealing caused by the misoperation of metering secondary wiring by non-related personnel under the condition that a metering secondary loop is not protected. The device is highin combination degree with an original device, materials are not occupied, a sealing protection function is added on the basis of original phoenix terminal wiring, and the wiring terminal can be flexibly disassembled and replaced.