The invention discloses a novel electric shock prevention child safety power supply device which comprises a power supply seat fixedly mounted in a wall and a power supply plug connected with electricity use equipment, wherein a center slot is formed in the center of the right end surface of the power supply seat; locking slots are symmetrically formed in the upper and lower end walls of the center slot; the right end of the center slot is provided with a guide slope; an upper plugging slot and a lower plugging slot are symmetrically formed in the power supply seat; elastic output power supplyblocks are mounted on the end surfaces, close to the center slot, of the upper plugging slot and the lower plugging slot; a sliding cavity which extends left and right and is communicated with the upper plugging slot and the lower plugging slot is also formed in the power supply seat; a sliding frame is mounted in the sliding cavity in a left-right sliding manner; a left-right connected transverse slot and an up-down connected longitudinal slot are formed in the sliding frame; a lower sliding strip is mounted in the longitudinal slot in a sliding manner; an inner sliding slot with an upward opening is formed in the lower sliding strip; an upper sliding strip is mounted in the inner sliding slot in a sliding manner; a fixed column matched with the transverse slot is arranged on the left end surface of the sliding cavity; the right end of the fixed column extends into the transverse slot.