Abstract: The nasal irrigation device has a container, a cover, a spout and a cap. The container has a neck and a tail. The cover is mounted detachably on the neck of the container and has a pressure adjusting hole. The spout is mounted detachably on the tail of the container and has a connecting tube connected to a guiding tube. The guiding tube has a nozzle. The cap is mounted detachably on the nozzle of the guiding tube of the spout. Therefore, the nasal irrigation device can be cleaned conveniently because all the components can be easily disassembled. Besides, the cap can plug the nozzle to stop a saline solution inside the container from spouting out and also can keep the nozzle clean.