Mouth dilator for gastroscopy

The utility model relates to the field of medical instruments, in particular to a mouth dilator for gastroscopy. The mouth dilator for gastroscopy comprises an upper baffle, a lower baffle, a placing tube, a first guide rod, a second guide rod and the like, an upper baffle and a lower baffle are jointly installed on the two symmetrical first guide rods, the upper baffle is located above the lower baffle, symmetrical second guide rods are installed in the middle of the upper baffle and the middle of the lower baffle, a containing pipe is jointly installed on the two second guide rods, and first springs are wound around the second guide rods. After a patient bites an upper biting block and a lower biting block, a plug pin is pulled out to be clamped with an insertion block by pulling the plug pin rightwards, and at the moment, a first spring rebounds to drive an upper baffle and a lower baffle to slide upwards and downwards along a first guide rod and a second guide rod respectively until the size matched with