Liquid fertilizer syringe needle head capable of preventing blockage and implementation method and application thereof

The invention discloses a liquid fertilizer syringe needle head capable of preventing blockage and an implementation method and application thereof. The liquid fertilizer syringe needle head comprises a needle tip cavity, a needle body cavity and a needle head and needle tube connecting part which are arranged in sequence from top to bottom; the needle tip cavity comprises a needle body shell, an injection orifice located on the needle body shell and an elastic part, a needle head piston, a piston connecting rod, a first valve connecting rod, a second valve connecting rod, an injection orifice valve, a connecting rod limiting rod, a connecting rod limiting block and two piston limiting blocks which are located inside the needle body shell; the elastic part is located on the top of the needle body cavity, and the rear portion of the elastic part is connected with the needle head piston; the needle head piston is connected with one end of the piston connecting rod located behind the needle head piston, and the piston limiting blocks are located on the inner wall of the needle body cavity and behind the needle head piston. According to the liquid fertilizer syringe needle head capable of preventing blockage, the structure is simple, the manufacturing cost is low, the parts used by the liquid fertilizer syringe needle head are all general parts, a complex and special structure does not exist, and the threshold is reduced for transformation, promotion and application of the technology.