Vacuum booster security control system and control method of strong hybrid electric vehicle

The invention provides a vacuum booster security control system and a control method of strong hybrid electric vehicle. The system comprises a hybrid vehicle control unit (HCU), an electric vacuum pump, a vacuum energy storage cavity, a pressure sensor, a relay and a wiring harness; the voltage value is judged through inputting the voltage signal of the pressure sensor to a main controller, thereby judging whether the vacuum degree reaches up to standard, if the vacuum degree is not within a calibration range, the main controllers sends out a digital low-level signal to close the relay, and the electric vacuum pump is connected with the power supply of the vacuum pump; after the vacuum pump works for a period of time, if the voltage signal detected by the sensor is within the calibration range, the vacuum degree of the vacuum energy storage cavity is indicated to meet requirements, and at the moment, the main controller controls the relay to be disconnected to stop the vacuum pump from working. The invention can effectively utilize vacuum assistance to complete braking demands, when fault occurs, the vacuum assistance braking fails, and the control system can detect voluntarily to alarm faults accurately and timely, thus significantly improving braking safety.