The invention discloses an electric connector with a temperature-resistant voltage-bearing structure, and the electric connector comprises a metal housing, a plastic housing, a conductor contact piece, an insulator, and a sealing ring. The metal housing is provided with a stepped hole, and the plastic housing is disposed in the metal housing and formed through injection molding of engineering plastics. The conductor contact piece and the insulator are disposed in the stepped hole of the metal housing and in the plastic housing. According to the invention, the conductor contact piece is disposed in the metal housing, the plastic housing and the insulator, and enables a working environment to be completely isolated at a state of electric signal conduction. Moreover, the electric connector can achieve unidirectional voltage bearing, is simple in structure, is reliable in sealing, is good in temperature-resistant voltage-bearing performances, and is long in service life.