The utility model discloses a multifunctional power supply disc. The multifunctional power supply disc comprises a power line wound on the power supply disc. The two ends of the power supply disc are movably connected with a support; one side of the support and the bottom of the support are respectively provided with a telescoping pull bar and a mobile wheel; one end of the power line is fixedly arranged on a wiring terminal row inside the power supply disc and is connected in series with a leakage protector through a lead; the other end of the power line is provided with a relay protection joint; the leakage protector is respectively connected with a relay protection interface and AC power output sockets through the lead; and the relay protection interface and the AC power output sockets are respectively arranged at the two ends of the power supply disc. According to the utility model, since one end of the power line is respectively connected with the relay protection interface and the AC power output sockets through the leakage protector, when a grounding or phase short-circuit fault is generated, the leakage protector acts to jump off from an air switch so as to cut off power and prevent a test instrument from being burnt; and the telescoping pull bar and the mobile wheel can move conveniently, and the power line is wound for collection, such that the space is saved, no knotting occurs, and additional external connection of a power line is unnecessary.