The invention discloses a novel electric power transfer equipment for a built-in transformer. The equipment includes a cylindrical base having four USB interfaces arranged on the top surface; a transformer is arranged in the base; primary winding of the transformer is connected to a firing line and a null line through a first cable, and secondary winding is connected to the USB interfaces througha rectifier filter circuit; the top of the base is provided with three groups of discrete modules which are placed in stacks, two adjacent groups of the discrete modules are in connection through a second cable and are combined through threads; the middle parts of the discrete modules are hexagonal prisms, and each side is provided with a set of sockets; the top of the discrete module located at the top layer is provided with an indicating lamp; the tops of the discrete modules located at the middle layer and the bottom layer sag to form wire boxes used for storing the second cable; and the bottom of the discrete module located at the bottom layer is fixed on the base. The equipment is flexible in usage and convenient in disassembling and assembling, and has larger coverage range than thatof universal sockets; and through the built-in USB changing interfaces, the trouble of users to add chargers can be avoided.