Mouth nursing device for critical patient

The invention discloses a critical patient mouth nursing device which comprises a fixed base, a water storage bin, a head positioning plate, a forward threaded rod, an adsorption cavity tube and a reverse threaded rod. The reverse threaded rod can rotate at a constant speed, and the threaded lantern ring in threaded connection with the surface of the reverse threaded rod can move while the reverse threaded rod rotates. Therefore, the movement states of the threaded lantern rings at the two far ends of the surface of the reverse threaded rod are always in a gathering mode and an extending mode during movement, then the first rotating rod and the second rotating rod can be stretched, and in the stretching process of the first rotating rod and the second rotating rod, the position of the head positioning plate can be adjusted, so that the head positioning effect is improved. In this way, the positions of the two head positioning plates can be adjusted so that the head of the patient can be fixed to the surface o