Diesel engine combustion system and vehicle

The invention belongs to the technical field of diesel engines and discloses a diesel engine combustion system and a vehicle. The diesel engine combustion system is defined by a cylinder cover, a piston and a cylinder sleeve, and an oil injector can inject oil into the diesel engine combustion system so that high-temperature fuel gas can be formed; an omega-shaped rotating cavity and a piston flow guide cavity annularly arranged at the edge of the omega-shaped rotating cavity are formed between one end, facing the inner end surface of the cylinder cover, of the piston and the cylinder cover; one end, deviating from the cylinder cover, of the piston flow guide cavity is closer to the cylinder cover than one end, facing the cylinder cover, of the omega-shaped rotating cavity; the piston flow guide cavity is provided with a piston flow guide cavity wall parallel to the axis of the piston, so that high-temperature fuel gas flowing to the inner wall of the cylinder sleeve is reduced; a cylinder cover flow guide ca