Engine with variable generating capacity and vehicle with engine

The invention discloses an engine with variable power generation capacity and a vehicle thereof, and the engine comprises a shell which is provided with a containing space; the engine assembly is at least partially arranged in the accommodating space; the power generation module is at least partially arranged in the accommodating space and comprises a stator and a rotor, and the driving part is connected with the stator; the stator has a first state close to the rotor and a second state away from the rotor, and the driving part is used for driving the stator to be switched between the first state and the second state. Compared with the prior art, the driving part is arranged to drive the stator to move on the set path, so that the area, penetrating through the coil, of the magnetic flux of the permanent magnet is adjusted, the power generation amount is variable, when the power generation amount is reduced, the proportion of converting mechanical energy into electric energy can be reduced, and the output powe