The invention belongs to the technical field of medical instruments, and particularly relates to an adjustable tracheal cannula fixing device. The device comprises an upper handle and a lower handle,the upper handle and the lower handle respectively comprise a left rod, a middle telescopic rod and a right rod, the rear ends of each left rod and each right rod are respectively hinged to a supportseat through a vertical hinge shaft, the rear end of each right rod is hinged to the support seat through the vertical hinge shaft, each support seat has the same structure, each rear side thereof ishinged to a bite rim through a transverse hinge shaft A, left telescopic rods and right telescopic rods are vertically arranged between the two ends of the upper handle and the lower handle, the lefttelescopic rods and the right telescopic rods have the same structure, sliding groovesareslidably formed in the left telescopic rods and the right telescopic rods, sliding blocksare slidably disposedon each of the sliding grooves, each of the sliding blocks is fixedly connected with a supporting rod, each supporting rod is horizontally disposed forward, and a tracheal fixing tube is disposed between the front ends of the two supporting rods. The device can solve the problem that a current tracheal cannula fixing device cannot bring a comfortable experience to a patient and is not humanized.