The utility model relates to a cooling system utilizing a pumping medium to cool the hydraulic oil, which comprises a conveying pump and a hydraulic oil tank connected with each other in series connection in the medium conveying main pipe. The utility model is characterized in that the hydraulic oil tank is provided with a disc serpentine tube, wherein the input end of the disc serpentine tube is communicated with the main pipe of medium conveying at the output end of the conveying pump through a connecting pipe, and the output end of the disc serpentine tube is communicated with the conveying main pipe at the input end of the medium conveying pump through the connecting tube and a regulating valve, so as to form a circulation loop of the medium, and by the flowing of the medium conveyed through the main pipe in the a disc serpentine tube, the cooling of the hydraulic oil is realized. The utility model has the apparent advantages that by bringing the conveying liquid medium into the disc serpentine tube to cool the hydraulic oil in the hydraulic oil tank, no cooling equipment is required to be added, and by the regulating valve arranged on the output end of the disc serpentine tube, the flowing speed of the diesel oil in the disc serpentine tube can be regulated, so as to meet the requirements of different working conditions; and the utility model has the advantages of simple structure and apparent cooling effect as well.