The invention discloses a liquid feeding apparatus, and belongs to the natural gas field. The liquid feeding apparatus includes a plurality of liquid storage cylinders which are arranged in a honeycomb shape, a liquid injection ball valve, a liquid feeding ball valve, and an automatic control system, wherein two ends of each liquid storage cylinder in the same row among the plurality of liquid storage cylinders are respectively connected with a first collecting pipe and a second collecting pipe; two ends of the liquid injection ball valve respectively communicate with the first collecting pipe and an oil jacket of a gas production tree of a natural gas well; two ends of the liquid feeding ball valve respectively communicate with the first collecting pipe and an liquid injection pump; and the automatic control system communicate with the liquid injection ball valve and the liquid feeding ball valve, and is used for controlling opening and closing of the liquid injection ball valve and the liquid feeding ball valve. The liquid feeding apparatus utilizes a honeycomb type high pressure liquid storage cylinder which is formed by assembling of the high pressure liquid storage cylinders, so as to adapt to the demand of field for high pressure resistance and liquid storage amount for the storage cylinders. The liquid feeding apparatus utilizes the automatic control medicine adding mode to reduce the labor intensity of medicine adding operators in the field and save one-time investment to vehicle high pressure medicine adding equipment.