Start-stop control system of mechanical engine of excavator and control method

The invention relates to a start-stop control system of a mechanical engine of an excavator. The start-stop control system comprises the engine, an accelerator motor, an ECU, a display instrument, a key switch, a stopping relay, a rotating speed sensor, a water temperature sensor, an accelerator driving disc, a starting relay and a starting motor, and the display instrument is connected with the ECU; the accelerator driving disc is connected with the ECU; the rotating speed sensor is connected with the ECU; the key switch is connected with the ECU; the ECU is connected with the starting relayand the stopping relay; the starting relay is connected with the starting motor; the stopping relay is connected with the engine; and the accelerator motor is connected with the ECU and the engine. According to the start-stop control system, through control over starting and stopping of the mechanical engine of the excavator, the accidents of journal sticking tile burning, scuffing of cylinder bore, cylinder holding and t