Reinforcing steel bar connecting coupler

The utility model relates to a reinforcing steel bar connecting coupler which comprises a reinforcing steel bar main body and a reinforcing steel bar coupler, coarse triangular reinforcing steel bar external threads are arranged on the surfaces of the two ends of the reinforcing steel bar main body, and internal threads meshed with the reinforcing steel bar external threads are arranged in the reinforcing steel bar coupler. The outer surface of the steel bar coupler, the internal threads and the steel bar external threads are all coated with epoxy resin coatings. The device is coated with the epoxy resin coating, and the epoxy resin coating does not have any chemical reaction, so that seawater corrosion and air oxidation are prevented, and the purpose of protecting the device is achieved; the minimum tensile strength of the internal thread of the steel bar coupler is 550MPa, the use performance of the internal thread of the thread rolling steel bar coupler meets the requirement that the yield strength grade i