The invention discloses a novel server cabinet cooling device. The device comprises supporting legs, a cooling liquid circulation box is installed at the tops of the supporting legs, a cabinet is installed at the top of the cooling liquid circulation box, and cooling fins are arranged in the cooling liquid circulation box. According to the invention, heat in the cabinet is blown away by a coolingmechanism, and the heat is absorbed by a cooling liquid in cooling pipes, so the cooling efficiency of the cabinet is improved; the cooling liquid is input into the cooling liquid circulating pipe from one of the cooling pipes; and in this process, the cooling liquid absorbs heat in the cabinet, then, under the action of stirring blades, stirring is performed to accelerate heat dissipation of thecooling liquid, the cooling liquid in the cooling circulation box is conveyed into the cooling liquid storage box under the cooperation of a transmission mechanism, a reset mechanism, a circulation mechanism and the other cooling pipe, in the process, the cooling liquid absorbs heat in the cabinet again, and cooling of equipment in the cabinet is achieved in a reciprocating mode, so the cooling efficiency of the cabinet is greatly improved.