The invention discloses a safety type three-pin power plug. The safety type three-pin power plug comprises a plug base and a pressure cover. The plug base is provided with a zero-wire terminal connected with a zero wire, a live-wire terminal connected with a live wire, and a ground-wire terminal connected with a ground wire. The pressure cover cooperates with the plug base for fixation, the pressure cover comprises a reinforced rib and two interval ribs arranged to be vertical to the reinforced rib. The two interval ribs, the reinforced rib and the outer wall of the pressure cover form three interval cavities. The zero wire, the live wire and the ground wire are respectively arranged in the interval cavities. Through such a mode, the safety type three-pin power plug can prevent other elements from damage due to electric sparks generated during an application process, enhances overall plug safety, and also can save energy at the same time.