The utility model discloses a remote monitoring vehicle-locking device for automatically locking a vehicle after outage, which is used for reducing the financial risk on selling engineering machineries. In a technical scheme, the remote monitoring vehicle-locking device comprises a vehicle-locking relay, an intermediate relay and a driving triode, the normally-open contact of the vehicle-locking relay is serially connected in a starting circuit of an engineering machinery or used for controlling a display screen power supply of the engineering machinery, the control coil of the vehicle-locking relay is connected with the storage battery voltage of the engineering machinery after serially connected with the normally-close contact of the intermediate relay, the driving triode is used for controlling the control coil of the intermediate relay, and the base electrode of the driving triode is connected with an output port of a microprocessor of a remote monitoring terminal. The utility model can guarantee the normal work of the engineering machinery after the monitoring terminal breaks down, automatically lock the vehicle after outage due to malicious destruction, and reduce the financial risk on sales by mortgage while guaranteeing the reliability of the engineering machinery.