The utility model discloses a heat-conducting oil filtering system connected with a heat-conducting oil system, wherein the heat-conducting oil filtering system comprises an oil injection pump, an oil filter, an oil storage tank and an expansion oil tank, which are sequentially connected; the oil injection pump, the expansion oil tank and the heat-conducting oil system are connected. The heat-conducting oil filtering system can be applied to the technical field of application of heat-conducting oil. The oil filter residue can be conveniently cleaned by using the heat-conducting oil filtering system, and the heat-conducting oil filtering system has the characteristics of being low in operation cost, simple to operate, convenient to maintain, flexible and portable, heat-conducting oil can be filtered at a fixed period, meanwhile, leakage caused by artificial oil discharge is avoided, an energy source can be solved, and the work efficiency is improved.