The utility model discloses a closed type variable plunger pump control valve which comprises a control valve body, a main valve core, a feedback spring, a shifting fork, a feedback rod and an eccentric pin, the lower end of the shifting fork and a rod body of the feedback rod are sleeved on the eccentric pin, the eccentric pin is fixed on the valve body, a valve core pin is arranged in the radialdirection of the middle of the main valve core, and throttling grooves are arranged on two sides of the main valve core. Oil ways of the left and right variable cylinders are slightly communicated through a throttling groove in the main valve element, and the pressure of left and right containing cavities of the variable cylinders is always equal and slightly lower than the outlet pressure of theoil supplementing pump. The main valve core moves left and right; therefore, the outlet high-pressure oil is communicated with an oil path of the variable cylinder; the pressure difference between the two ends of the valve port is small, the acting force of oil borne by the main valve element is small, and therefore the problem that the main valve element shakes due to the fact that the pressuredifference is too large when the control valve is opened is solved, the pressure impact phenomenon in the variable cylinder is avoided, the variable rod swings stably, and finally oscillation of the output flow of the closed variable plunger pump is reduced.