The invention provides a portable water-blocking tape wrapping device for a conductor. The portable water-blocking tape wrapping device is detachably mounted on conductor winding equipment by adopting a fixed support, and the wrapping device is convenient to mount and process; the portable water-blocking tape wrapping device comprises a main winch body, wherein the main winch body consists of a circular plate and a hollow sleeve arranged in the center of the circular plate; the two ends of the hollow sleeve are both protruded out of the side surface of the circular plate; a driven wheel fixedly connected with the driven wheel sleeves the hollow sleeve protruded out of one side of the circular plate, and a wrapping tape ring gasket, a winch baffle and winch fastening screws sequentially sleeve the hollow sleeve protruded out of the other side of the circular plate, wherein the wrapping tape ring gasket is used for storing a water-blocking tape; the winch baffle is used for retaining the water-blocking tape contained in the wrapping tape ring gasket; the winch fastening screws are used for fixing the main winch body, the winch baffle and the wrapping tape ring gasket into an overall movement unit; an full-angle adjustable wrapping tape guide wheel is adopted, so the wrapping angle and pitch of the water-blocking tape can be adjusted freely; a transmission shaft is adopted to connect with a gear change mechanism of a main machine, so that the portable water-blocking tape can be synchronized with the winching equipment without requiring extra power.