The utility model relates to the technical field of glue smearing, and discloses a full-automatic precise glue smearing device which comprises a
barrel, a storage cavity, a balance weight cavity and a discharging cavity are sequentially formed in the
barrel from top to bottom, the storage cavity communicates with the balance weight cavity through a pipeline, the balance weight cavity communicates with the discharging cavity through a pipeline, and valve bodies are arranged in the pipelines; the balance weight cavity is of a double-layer structure, the inner layer of the balance weight cavity is an elastic diaphragm, a first air bag is arranged in the balance weight cavity jacket, a ventilation mechanism is arranged outside the
barrel and can convey air into the first air bag, and the ventilation mechanism comprises a second air bag arranged on the outer surface of the barrel in a sleeving mode. The storage cavity is used for storing glue, and when the glue is smeared, a user can use the ventilation mechanism to convey air into the first air bag and adjust the internal space of the elastic diaphragm, namely, the storage space of the glue in the elastic diaphragm can be controlled, and the purpose of controlling the glue smearing amount is achieved.