Amphibious vehicle engine multi-power control method and system

The invention belongs to the field of engine control, and particularly discloses an amphibious vehicle engine multi-power control method and system. The method comprises the steps that a power distributor selects a water gear or a land gear, an engine ECU introduces a land gear combination state signal of the power distributor, if the land gear combination state signal is Y, the engine ECU controls an engine to output torque and conduct low-power output, and if the land gear combination state signal is N, the engine ECU controls the engine to output torque and conduct high-power output, and whether a water short-time limit working mode is started or not is judged. The system comprises the engine, the power distributor, a gearbox, paddles and a control system. The control system comprises the engine ECU and a vehicle control unit (VCU). The power output of land running low power, overwater high-speed sliding high power and overwater transition starting sliding navigation limit power can be met, the vehicle ser