The present invention relates to a composite structure large power contact preventing from arcing starting. The contact comprises a jack and a pin, the jack comprises a jack body, a central pin, a jack crowned spring and a jack prevention contact, the pin comprises a pin body, a pin prevention contact and a pin crowned spring, the jack crowned spring is arranged in the inner groove of the inner wall of the insertion cavity of the front end of the jack body, the central pin having a prevention contact at the front end is arranged in the insertion cavity, the front end of the pin body is provided with a prevention contact, the front end of the pin body is inserted in the jack crowned spring in the insertion cavity of the front end of the jack body, and the jack crowned spring inserted with the central pin is arranged in the insertion cavity of the front end of the pin body. After the insertion body is inserted with the jack body, the jack crowned spring in the jack body is in contact with the outer surface of the pin body, and the central pin in the jack body is in contact with the jack crowned spring of the pin body to realize contact of double curved surfaces, the structure contact is reliable, the contact area is larger, the contact resistance is lower, and the composite structure large power contact preventing from arcing starting is especially suitable for a transmission mode with large current and high power to allow a connector to be more convenient and much safer in the usage process.