The function of high-pressure metering pump of polyurethane foaming machine is to convert mechanical energy into hydraulic energy. When the motor drives the main shaft of the pump to rotate, the cylinder block is driven to rotate through the connecting rod plunger. Since the cylinder block axis and the main shaft axis form an included angle, the plunger ground cylinder body makes reciprocating motion, and the volume of the plunger hole in the cylinder body changes. When the volume changes from small to large, the medium is sucked in from the suction port of the pump and enters the column plug hole through the low-pressure window of the port plate. When the volume changes from large to small, the medium is discharged from the pump outlet through the high-pressure window of the port plate.