The invention relates to a compact stroke increasing electric vehicle capable of disengaging from an engine and a control method thereof. Concretely, the stroke increasing electric vehicle comprises a small-scale engine, wheels, a battery group provided with a battery state of charge (SOC), and a clutch, the clutch selectively connects an output member of the engine to a generator. The vehicle also comprises an air conditioner (AC) compressor with power supplied by the battery group and/or the generator and a motor. The power output of the generator is parallelly divided between the battery group and the motor. The AC compressor is continuously driven by the output member of the engine in a mere electric (EV) mode and a serial mode. A controller is in a joint with the clutch based on the battery SOC to establish the serial mode and disengaged from the clutch to establish the EV mode. The power of the engine can be supplied by liquid propane gas from a box, and the box is disposed in a spare wheel cabin. A method for controlling the vehicle is also disclosed.