Remote control system of vehicle door and control method for remote control system

The invention discloses a remote control system of a vehicle door and a control method for the remote control system. The control method comprises the following steps: a, when a wireless signal receiver receives a vehicle door opening signal, a first infrared sensor, a second infrared sensor, a microwave detector and a counter start to operate, and the microwave detector performs initial detection and stores a detection result, wherein the initial value of the counter is 0; b, when an infrared signal is received by the first infrared sensor firstly, then the infrared signal is received by the second infrared sensor, the numerical value of the counter is increased by 1, and when the infrared signal is received by the second infrared sensor firstly, the numerical value of the counter is decreased by 1; c, when the wireless signal receiver receives a door locking signal transmitted by a remote control key, a control unit firstly judges whether the numerical value of the counter is 0 or not, and if yes, a doorlock controller transmits a signal to a doorlock driving device, so that the doorlock driving device controls the doorlock to lock. Through judging the numerical value of the counter, the situation whether a passenger is in a vehicle or not can be judged, appropriate prompt can be supplied for a vehicle owner, and a child can be prevented from being locked in the vehicle.