The invention provides a movable testing system for a transformer inter-turn insulating electrical aging simulation test. The movable testing system is characterized by comprising a box with a box cover, wherein the bottom of the box and the box cover are aluminum alloy plates and the walls of the box are formed by use of epoxy resin resins; rubber sealing rings are arranged between the box bottom and the box cover, and the walls of the box; universal castors are arranged at the bottom surface of the box bottom; round through holes are formed in the centers of the box cover and the box bottom, and connected with an air guide pipe and a transformer oil guide pipe, respectively; each of the other ends of the air guide pipe and the transformer oil guide pipe are connected with a ball valve and a quick connector; a low-voltage lead connecting bolt is further arranged on the upper surface of the box bottom in the box body, while a ground wire connecting bolt is arranged on the box bottom outside the box body; an insulating support is arranged in the box body. The testing system is capable of meeting the mobility and the treatment requirements of vacuum supply during the test; high-voltage wire connection is convenient, and abnormal discharge of the high-voltage lead to the metal part of the box body at the ground potential can be avoided; the insulating support serves as an insulating support for a model coil, and the discharge phenomenon outside inter-turn insulation breakdown can be prevented in the testing process.