The invention discloses an electric power fitting comprising a base, a plane nut and two sets of pressing claw components. Each set of pressing claw component comprises three pressing claws. The base is provided with a slide pipe and radial guide position limiting holes which are arranged on the slide pipe. The plane nut sleeves the external circumferential wall of the side pipe of the base and is arranged between the two sets of pressing claw components. Each pressing claw is arranged in one corresponding radial guide position limiting hole. The two side ends of the plane nut are respectively provided with a plane thread part. Each plane thread part is adaptive to the driving thread part of the three pressing claws of one adjacent set of pressing claw component in an engaged way. The plane nut synchronously drives the two sets of pressing claw components to be close to each other towards the center of the slide pipe or away from each other. Each pressing claw is also provided with a pressing plate part and a guide slide block part. The internal wall of each pressing plate part is provided with multiple stabs. Each stab inwardly protrudes along the radial direction of the slide pipe of the base. The stabs of each pressing claw and the pressing claw are integrally manufactured through cast molding. The fastening parts of the plane nut are multiple fastening grooves arranged at the external circumferential wall of the plane nut. The electric power fitting has a great anti-loosening effect.