The invention discloses a multifunctional rechargeable inverter. Structurally, the inverter comprises a shell, a switch button, a charging socket, a fault display device, a connection port, a storage battery, a step-up transformer, a driving plate and a radiator; the shell is of a cuboid structure, and the fault display device is arranged on the side surface of the shell; the multifunctional rechargeable inverter is provided with the fault display device, a line operating device is sensed by a fault sensor, a processor processes sensed data, then the data is converted into a desired form by a conversion chip to be displayed on a display screen, and therefore a fault of line operation can be quickly detected and automatically displayed on the screen; a user can directly and conveniently clear the fault according to fault information, the fault maintenance efficiency and maintenance accuracy are effectively improved, the consumed time for troubleshooting is effectively reduced, the time and effort are saved, and the maintenance is convenient.