The invention discloses a friction moment test method for a no-load elevator brake. The friction moment test method comprises the following steps of: measuring the diameter D of a traction wheel and a distance d between the center of a traction steel wire rope and the wheel edge of the traction wheel; measuring mass m1 of a car and mass m2 of counterweight by a weighing device; arranging an acceleration sensor and corresponding data acquisition equipment on the elevator car; separately enabling an elevator to upwards move in a non-load state to an uniform-speed state and downwards move to an uniform-speed state, cutting off power, emergently braking the elevator, and separately reading elevator car acceleration a when the elector moves upwards in the non-load state and elevator car acceleration a' when the elevator downwards moves; and obtaining rotational inertia and brake friction moment Mf of an elevator brake system through a formula obtained by analyzing an elevator brake process according the mass m1 of the car, the mass m2 of the counterweight and the theorem of moment of momentum. According to the friction moment test method disclosed by the invention, the friction moment, output by the brake under an emergent brake condition, of the brake is researched from the mechanical point, parameters can be provided for design of the brake, and reference is provided for accessing performances of the brake and making relevant standards.