The invention provides an inertia roller stand automobile braking performance detection method. The equivalent inertia M and the resistance fi of the stand of each side and the equivalent inertia G ofwheels are known, the motor drives the rollers to the appropriate speed at variable frequency and then powers off when the non-driven wheels are detected, the speed and the time in the left and rightstand roller deceleration process are measured, the deceleration of each speed point and the system resistance of the two stands are calculated and fi is subtracted and then the wheel resistance canbe obtained, motor driving is not required when the driving shaft is detected, the rollers are driven to the specified speed at the low speed gear and then the throttle is loosened and the idling gearis on, and the wheel resistance is measured by the similar way of the non-driven wheels; and then the speed reduces to the specified speed and pedaling the brake is prompted, the brake pedal is pushed to the bottom, the speed and the time of the left and right stand rollers of the same moment are measured, the deceleration of each speed point and the system driving braking force are calculated and fi is subtracted and then the wheel driving braking force can be obtained, and the driver is prompted to loosen the brake pedal when the slip ratio of any one side of stand is greater than or equalto the specified slip ratio and the wheel parking braking force is measured by the similar way.