The invention discloses a smart-key-free vehicle control system and method. The smart-key-free vehicle control system comprises a head unit, an application program, a communication part, a vehicle body control module, a starting button and a control part, wherein the head unit is provided with passwords used for operation and can generate QR codes, the application program is arranged at a user terminal and can scan the QR codes, the communication part is connected with the application program, the vehicle body control module controls a vehicle according to a remote control signal of the application program, the starting button is formed in the vehicle and generates a starting (ON) signal through button input, and the control part controls starting of the vehicle.