The invention discloses a water-cooled electromagnetic bleeding-stopping needle, belonging to the field of medical devices. The water-cooled electromagnetic bleeding-stopping needle comprises an outer conductor (1), an inner conductor (2), a medium layer (3) and a water guide pipe (5), wherein the outer conductor (1) is a hollow cylinder, the inner conductor (2) is arranged in the outer conductor (1), the space between the inner conductor (2) and the outer conductor (1) is filled with the medium layer (3), the inner conductor (2) is a hollow cylinder, the water guide pipe (5) is arranged in the inner conductor (2), and placed along the axial direction of the inner conductor (2), and a gap is reserved between the water guide pipe (5) and the inner conductor (2). The water-cooled electromagnetic bleeding-stopping needle is ingenious in structure, while the problems existing in the water-cooling circulating systems of the traditional electromagnetic bleeding-stopping needles are solved, the size of the water-cooled electromagnetic bleeding-stopping needle provided by the invention is effectively reduced, further, by adjusting the position of a metal sleeve, the number of effective gaps is randomly regulated from one to more according to the electromagnetic shielding principle, so that the actuating range and effect shape of electromagnetic waves are changed.