High-pressure injector connecting device

The utility model discloses a high-pressure injector connecting device which comprises an indwelling needle, and the indwelling needle comprises a steel needle, a catheter, a transparent three-way pipe, a blocking plug, a needle holding handle, an extension pipe and a connector. The steel needle is sleeved with the catheter. One end of a straight pipe of the transparent three-way pipe is connected with the end part of the conduit, the other end of the straight pipe of the transparent three-way pipe is provided with a blocking plug, and a branch pipe of the transparent three-way pipe is connected with one end of the extension pipe; the needle holding handle is arranged beside the blocking plug; one end of the connector is connected with the other end of the extension tube, the other end of the connector is provided with a connector, and a heparin cap is arranged at the connector; the high-pressure injector connecting device further comprises a one-way valve, the one-way valve is arranged between the extension