The invention discloses a wide-temperature-range adaptive-adjusting multifunctional friction wear testing machine, which relates to the technical field of friction wear testing machines, and meets therequirement of performing friction wear testing on a sample in a wide-temperature-range environment with low, normal and high temperatures by the friction wear testing machine. The wide-temperature-range adaptive-adjusting multifunctional friction wear testing machine comprises a testing cavity; a rotating disc and a liquid nitrogen cavity which are oppositely arranged are arranged in the testingcavity; a heating tool is arranged on the surface, directly facing the rotating disc, of the liquid nitrogen cavity; a heating coil is wound around the outer wall of the heating tool; and a test fixture is detachably connected to the surface, directly facing the rotating disc, of the heating tool.