The utility model discloses a portable vehicle-mounted emergency lighting device for construction. The portable vehicle-mounted emergency lighting device for the construction is installed on a vehicle. The vehicle comprises a vehicle electric generator and a storage battery connected with the vehicle electric generator. The emergency lighting device comprises a power source converter and a metal halide lamp. The power source converter comprises a direct-current 12V/24V input interface, a DC/AC inverter and an alternating-current 220V output interface. The output end of the direct-current 12V/24V input interface is connected with the input end of the DC/AC inverter. The output end of the DC/AC inverter is connected with the input end of the alternating-current 220V output interface. The input end of the direct-current 12V/24V input interface is connected with the storage battery in parallel. The metal halide lamp is connected with the output end of the alternating-current 220V output interface. The portable vehicle-mounted emergency lighting device for the construction has the advantages of being simple in structure, low in cost, convenient to carry, convenient and fast in wiring, free of the requirement for maintenance, convenient to use and the like, and meanwhile, the lighting height is greatly improved.