The invention relates to the technical field of hydraulic control elements, in particular to an oil cylinder fast drop valve. The oil cylinder fast drop valve comprises a valve body, a rodless chamber oil channel, a rod chamber oil channel and a check valve are formed in the valve body, the rodless chamber oil channel and the rod chamber oil channel are communicated through a side portion passage, and the check valve is arranged on the side portion passage. The rodless chamber oil channel is communicated with a cavity B of the upper portion of the check valve through an oil channel A. A throttle valve is arranged between the upper end oil port and the lower end oil port of the rod chamber oil channel, and the throttle valve is arranged below the oil channel A and above the side portion passage. The oil cylinder fast drop valve has the advantages that rapid oil supplement on an oil cylinder rodless chamber can be guaranteed when a shovel blade descends, hydraulic system elements can be prevented from being damaged due to negative pressure, lifting speed of the shovel blade is guaranteed, unnecessary back pressure is avoided, energy consumption is lowered, the whole process is carried out in a fully-automatic mode, and safe, automatic, economic and stable operation of a shovel blade lifting oil cylinder is achieved.