Dispensing valve

The invention discloses a dispensing valve. The valve comprises a diaphragm, a glue nozzle, a plunger piston, a hollow-structure cylinder body and a hollow-structure glue storage body, wherein the cylinder body and the glue storage body are fixed in a butted manner so as to enable the hollow structures of the cylinder body and the glue storage body to form a sealed cavity together; the outer side of the diaphragm is fixed between the cylinder body and the glue storage body in a pressing against manner; the diaphragm divides the sealed cavity into a colloid storage cavity and a plunger piston movement cavity; the cylinder body is provided with an inlet and an outlet for being communicated with the plunger piston movement cavity; the glue storage body is provided with a glue output port for being communicated with the glue storage cavity; a glue nozzle is installed on the glue storage body in a sealed manner, used for sealing the opening of the glue storage cavity, and provided with a dispensing channel communi