The invention relates to the technical field of agricultural fertilization, in particular to a
drip irrigation device for tea planting, which comprises a water and
fertilizer tank mounted on a support, a liquid inlet at the top of the water and
fertilizer tank is externally connected with a water and
fertilizer pump, a liquid outlet at the bottom of the water and fertilizer tank is communicated with a connector, and a liquid outlet port of the connector is hermetically communicated with a
branch pipe. The end part of the
branch pipe is communicated with a fertilization
pipe, and an open-close type water dropper is mounted in the fertilization pipe; the fertilizer applicator further comprises a blow-down valve arranged at an outlet of the
tail branch pipe, a plug is slidably mounted in the blow-down valve, a first spring is arranged between the blow-down valve and the plug, and a sealing mechanism is arranged on the fertilizer applying pipe. The blow-down valve is arranged at the outlet of the
tail-section branch pipe, and the air bag and the closing plate are integrated on the fertilization pipe, so that when the
water pressure exceeds a preset threshold value of the plug, the blow-down valve is automatically opened, deposited impurities in the pipe are intensively discharged, regular self-cleaning without manual intervention is realized, and the blocking risk is effectively reduced.