The invention discloses a plastic circular weaving machine and belongs to the field of plastic weaving machines. The problem that in the prior art, the operation that a jumping bar forms a thread-out halt loop through a spring is not reliable is solved. According to the technical scheme for solving the problem, mainly, a contact tube, jumping bars, separators, outer bars, inner bars and connecting fulcrum bars are arranged on a rack, the separators are connected to the outer bars and the inner bars and separate the jumping bars one by one, and the rack is further provided with conducting fulcrum bars. Each jumping bar comprises a metal bar and an insulator, one end of each metal bar penetrates through a tying-in wire, the other ends of the metal bars are elastically connected to the connecting fulcrum bars, the insulators are arranged in the middles of the metal bars, installing grooves matched with the conducting fulcrum bars are formed in the insulators, exposed sections exposed from the groove walls of the installing grooves and kept in contact with the conducting fulcrum bars are arranged in the middles of the metal bars, and the metal bars make contact with the contact tube after thread-out is completed to enable the conducting fulcrum bars and the contact tube to be conducted. The plastic circular weaving machine is mainly used for processing plastic woven bags.