Protective sleeve for venous indwelling needle

The utility model belongs to the technical field of medical instruments, and particularly discloses a venous indwelling needle protective sleeve which comprises a protective sleeve whole body, a needle head protective paste, a composite application, a needle seat buckle and an extension tube fixing piece, the needle head protective paste is fixedly connected to the front face of the protective sleeve whole body, and the composite application is fixedly connected to the middle of the needle head protective paste. The top end of the rear face of the composite application is fixedly connected with a needle base buckle, the rear face of the whole protective sleeve is fixedly connected with an extension tube fixing piece, the extension tube fixing piece firmly fixes an extension tube and a heparin cap on a fixing plate through the fixing plate, the extension tube buckle and the heparin cap buckle, and the protection performance of the protective sleeve is improved; through cooperation of the composite application,