The invention provides a state monitoring method of a vehicle-mounted system of an unmanned ground platform and a vehicle-mounted system. The method comprises: self checking is carried out when a vehicle-mounted system is started; if a monitoring module of the vehicle-mounted system works normally, the monitoring module receives a turning-off instruction and vehicle-mounted system is turned off; otherwise, the monitoring module of the vehicle-mounted system checks the vehicle-mounted system, the monitoring module of the vehicle-mounted system sends a hang-up command to an abnormal module and aprogress in the abnormal module is hung up, and the vehicle-mounted system is started for working; and after the vehicle-mounted system in operation receives a trigger instruction, the monitoring module of the vehicle-mounted system checks the vehicle-mounted system, if abnormity of the vehicle-mounted system is monitored and discovered, parking planning is carried out or the vehicle-mounted system is turned off. Therefore, the abnormal state of the system can be found out timely and the abnormal location can be located timely, so that the system reliability and debugging efficiency of the unmanned platform are improved.