The invention provides a method of judging steam turbine oil use performance from the perspective of friction performance. An SRV test-use test disc is polished to flatness, and the test disc and a test ball are ultrasonically cleaned; the test ball and the test disc are installed on an SRV test machine, test oil is dripped on the test disc, and a test is carried out in an appropriate test condition; after the test ends, the test disc is cleaned, a metallographic microscope is used to measure wear spot width of the test disc, and a three-dimensional white light interferometer is used to measure wear spot depth of the test disc and wear volume; and when the wear volume of the used oil is more than 2.5 times of wear volume of new oil, it is judged that a relatively obvious deterioration trend of the oil exists, and intervention needs to be carried out on the oil. The method effectively solves the problem that friction performance of motor oil cannot be judged in the prior art.