The invention discloses a fixing structure of a vamp shaping machine. The fixing structure comprises a workbench, a softening mechanism and a shaping mechanism, wherein the shaping mechanism comprisesa vibration generator, an upper pressing die, a lower pressing die, an air cylinder and a supporting frame; an adsorption structure is arranged on the lower pressing die, the adsorption structure comprises an air pump, an air cavity is formed in the lower pressing die, and an air suction hole communicated with the air cavity is formed in the upper surface of the lower pressing die; a connecting port is formed in the lower pressing die, and the air pump is connected with the connecting port. When a vamp is shaped, the vibration generator vibrates the upper pressing die, so that when the upperpressing die is in contact with the vamp, the vamp is vibrated, wrinkles on the vamp is vibrated to be flat, then the upper pressing die and the lower pressing die press the vamp, and the vamp is formed after pressing. Air in the air cavity is sucked out through the air pump, and negative pressure is generated on the air suction hole, so that the vamp is attached to and adsorbed on the surface ofthe lower pressing die. During pressing, the vamp is pressed and formed according to a placed state, and deformation cannot be generated in the pressing process, so that the wrinkles of the vamp during pressing and shaping are effectively prevented, and the shaping quality is improved.