The invention discloses a high-safety power supply apparatus. The high-safety power supply apparatus comprises a fixed socket and a plug, wherein the fixed socket is formed by combining a power supply part with a combining part; the plug is provided with a wire at the bottom; an inserting slot, which is formed in a downward extension manner, is formed in the center of the interior of the power supply part; the bottom of the inserting slot is connected with the combining part in a run-through manner; a baffle is arranged on the top wall in the interior of the inserting slot; first sliding slots are formed in the power supply part on the left and right sides of the baffle respectively; an accommodating cavity is formed in the bottom of each first sliding slot; a second sliding slot is formed in the combining part at the bottom of each accommodating cavity; a first sliding connecting block is arranged in each first sliding slot; a spring inserting hole is formed in the inner side of the bottom of each first sliding connecting block; a first tooth-shaped part is arranged at the bottom of the first sliding connecting block outside the spring inserting hole; a tooth-shaped wheel connected with the bottom of the first tooth-shaped part in a meshing manner is arranged in each accommodating cavity; a second sliding connecting block is arranged in each second sliding slot; an inclined sliding locking rod, which is connected with the combining part in a run-through manner and is in sliding and connecting match, is arranged outside each second sliding connecting block; an inclined sliding bump part is arranged on one side, deviating from the inclined sliding locking rod, of each second sliding connecting block; and a second tooth-shaped part, which is connected with the bottom of the corresponding tooth-shaped wheel in a meshing manner, is arranged on the top end plane of each second sliding connecting block.