The invention provides a vehicle and an engine device thereof, and relates to a vehicle. The engine device comprises a plurality of first cylinder assemblies, a transmission mechanism and a control system. Each of the multiple first cylinder assemblies is provided with a crankshaft capable of outputting power. The transmission mechanism can transmit the output power of all the first cylinder assemblies to the vehicle and can be connected or disconnected with all the crankshafts so that each of the multiple first cylinder assemblies can independently work. The control system can make the crankshafts of the first cylinder assemblies to stop rotating so that the power consumption and fuel oil consumption of the engine device can be reduced. The control system can control the connected transmission mechanism and crankshafts to be disconnected. Under the situation of part of loads, the engine device can make the crankshaft or the crankshafts of one or more first cylinder assemblies stop rotating.