The invention discloses a test method of identifying steam turbine speed regulation valve leakage. A high pressure main valve, a high pressure regulating valve, a middle pressure main valve and a middle pressure regulating valve are included. The method comprises a technology scheme of determining single main valve leakage and a technology scheme of determining leakage of a regulating valve group corresponding to the main valve and a single leaked main valve or the regulating valve can be identified. During overhauling, a definite target is determined and overhauling efficiency is greatly increased. The invention is the test method of identifying steam turbine speed regulation valve leakage. Aiming at a condition that a heat-engine plant valve leakproofness test is not qualified, the single leaked main valve and a speed-regulation valve group corresponding to the main valve can be identified, and valve overhauling efficiency is greatly increased.