The invention discloses a halt control method and system of a hybrid power vehicle. The halt control method comprises the steps of: judging a reversal-preventing control entry condition; if according with the reversal-preventing control entry condition, controlling an engine to prevent from reversing, wherein the control step comprises the procedures of detecting in real time to obtain an engine rotating speed signal of reflecting a rotating speed of an engine; comparing the rotating speed signal of the engine with a preset ideal rotating speed of the engine to obtain a rotating speed difference; calculating the rotating speed difference through a PID controller to obtain a theoretical target motor output torque, calculating according to the theoretical target motor output torque to obtain an actual target motor output torque needing being implemented by a motor, sending a command for implementing the actual target motor output torque to the motor; and implementing the actual target motor output torque by the motor, and acting the torque implemented by the motor to the engine. Therefore, the reversal of the engine before automatic halt can be prevented.