Engine supercharging system, control method and vehicle

The embodiment of the invention provides an engine supercharging system, a control method and a vehicle, and relates to the technical field of superchargers, the engine supercharging system comprises an engine, a plurality of turbochargers, a mechanical supercharger, a first valve, an air filter and an electronic control unit ECU; the multiple turbochargers are connected in series and/or in parallel, a turbine of the first turbocharger is connected with an exhaust manifold of the engine, and an exhaust port of a gas compressor of the first turbocharger is connected with a gas inlet of the mechanical supercharger; an air inlet of the mechanical supercharger is connected with the air filter, and an air outlet of the mechanical supercharger is connected with an air inlet header pipe of the engine; an exhaust port of the gas compressor of the first turbocharger is further connected with an exhaust port of the mechanical supercharger through a first valve; when the rotating speed of the engine is lower than the se