A safety energization device for power comprises an installation base, a power supply seat and a power supply plug device, wherein the power supply seat is arranged in the installation base, the power supply plug device is matched with the power supply seat, an installation groove with a leftward opening is formed in the installation base, the power supply seat is arranged in the installation groove in a sliding way, a slot with a leftward opening is also formed in the power supply seat, power supply grooves are formed in an upper wall and a lower wall of the slot, a tensile elastic piece is fixedly connected with the power supply seat, the power supply plug device comprises a main body part, a sliding rack and a power supply head, a sliding cavity is formed in the main body part, the sliding rack is arranged in the sliding cavity in a sliding way, two inclining grooves are vertically and symmetrically formed in a right end of the sliding rack, two guide grooves are vertically and symmetrically formed in a left end of the sliding rack, two guide rods are vertically, symmetrically and fixedly arranged on a left end wall of the sliding cavity, right ends of the guide rods extend to the guide grooves, and the power supply head is arranged in the inclining grooves in a sliding way.