The invention discloses a cutting method of an anti-deformation cutting device for a metal hose. The rotation speed of a cutter body is 0.5N time that of the metal hose, wherein N is a positive integer, and besides, the cutter body rotates only one circle. The two ends of the metal hose are disposed in a cylindrical storage tank with the middle being hollow. The storage tank is provided with fourthrough holes which are in threaded connection with connection rods. The two ends of the connection rods are located outside the through holes. The end, in the storage tank, of each connection rod isconnected with a connection plate. The connection plates on the four connection rods form a hollow cylinder. The connection rods rotate in the through holes so as to adjust the distance between the connection plates and the inner wall of the storage tank. The metal hose is fixed in the hollow cylinder formed by the four connection plates. When the metal hose is cut through the cutting device, stress can be effectively relieved, the metal hose is prevented from deforming when cut, and long-term usage is facilitated.