The utility model belongs to the field of resistor mounting structures, and provides a resistor mounting structure of a resistive load box. The resistor mounting structure comprises partitions at the two ends of the resistive load box and U-shaped resistance tubes, wherein the partitions comprise a left glass partition and a right partition; a plurality of hooks are uniformly arranged on the left partition; the right partition is formed by overlapping and bonding an insulating plate and a micanite; the micanite exactly faces the left partition; through holes, in one-to-one correspondence with the hooks, are formed in the right partition; the U-shaped ends of the resistance tubes are hooked with the hooks, and terminals of the resistance tubes penetrate through the corresponding through holes to be fixed; insulating check rings are arranged at the front end and the right end of each through hole. According to the resistor mounting structure, the U-shaped resistance tubes and the partitions with the excellent insulation column effect are adopted, so that the resistance tubes can be arranged on the same side, well sealing and protection of the tubes can be realized, and the integrally corrosion-resistant, damp-proof and rainproof effect is excellent.