The invention discloses an engine igniter start interlocking control system and a control method thereof. The system comprises a storage battery, an inverter and a starting motor which are mutually electrically connected, and an MCU used for controlling starting. The starting motor is a sensorless permanent-magnet synchronous motor. A first electronic switch is connected between the storage battery and the inverter, and/or second electronic switches are connected between the inverter and the starting motor. The voltage output end of the starting motor is connected to an igniter start interlocking device. The igniter start interlocking device outputs a start state signal of the starting motor, and it is judged that whether the first electronic switch and/or the second electronic switches are/is controlled to be turned off or not according to the start state signal. According to the engine igniter start interlocking control system and the control method thereof, the state of an engine atthe time of ignition starting can be accurately judged, accordingly, an ignition interlocking function of the engine is reliably achieved according to the state of the engine, the control system provided by the invention is simple, the control method is easy to achieve, and in addition, the safety and reliability of the igniter controller at the time of starting of the engine can be effectively guaranteed.