The invention discloses a robot grinding consumable automatic replacing system applying infrared temperature measurement. The robot grinding consumable automatic replacing system structurally comprises a main shaft rod, a joint frame, a device shell, a friction wheel, a through hole and an intelligent replacing device, wherein the device shell is located on the right end face of the joint frame and is in clearance fit with the joint frame, the main shaft rod and the joint frame are perpendicular to each other and fixedly connected into an integrated structure, the intelligent replacing deviceis located in the device shell and movably connected with the device shell, the friction wheel is located on the left end face of the intelligent replacing device and connected with the intelligent replacing device in a clamped mode, and the through hole is formed in the center of the left end face of the friction wheel to form an integrated structure, so that grinding wheel loss monitoring is carried out by the infrared temperature measurement principle instead of manual work; automatic grinding wheel output is carried out by utilizing the characteristic of thermosensitive magnets, so that the disassembling difficulty is lowered; and cooperative fixing and separation are carried out in a magnetic attraction mode, so that stability is improved, and labor intensity is lowered.