Diesel engine combustion chamber, piston and diesel engine

The invention relates to a diesel engine combustion chamber, a piston and a diesel engine. The first combustion cavity is concavely formed in the top surface; the second combustion cavity is concavely arranged on the top surface around the circumferential direction of the first combustion cavity; the throttling ridge is arranged between the first combustion cavity and the second combustion cavity in a protruding mode in the circumferential direction of the first combustion cavity, and in the protruding direction of the throttling ridge, the protruding point position of the throttling ridge is higher than the concave point position of the second combustion cavity. According to the diesel engine combustion chamber, the space and air in the air cylinder can be fully utilized, the combustion efficiency of fuel oil is improved, soot particle emission is reduced, more space and working media in the air cylinder are heated through the fuel oil under the same heat release amount, the temperature in the air cylinder i