The utility model relates to the technical field of plastic cup devices, and provides a high-strength anti-deformation PET plastic cup which comprises a cup body, a plurality of reinforcing rib plates are fixedly arranged on the outer surface of the cup body, the reinforcing rib plates can effectively disperse stress on the upper middle portion of the cup body, and deformation and
cracking of a cup opening caused by local
stress concentration of the cup body are reduced. The multiple reinforcing rib plates are arranged in the middle and at the bottom of the outer wall of the cup body, the bending resistance and deformation resistance of the outer wall of the cup body are enhanced, the spiral rib plates on the inner wall of the cup body can transmit and disperse external force in the spiral direction when the cup bears torsional force or lateral pressure, local
stress concentration is reduced, and the cup body is movably sleeved with the outer protection cup sleeve. The outer protection cup sleeve can bear a part of external force and reduce pressure borne by the cup wall of the cup body, the overall strength and rigidity of the cup are improved through the double-layer structure, the outer portion of the outer protection cup sleeve is corrugated, the surface area of the cup wall is increased, the rigidity of the cup is improved, and the corrugated structure of the outer protection cup sleeve can disperse the external force to the positions between wave crests and wave troughs so that deformation can be reduced.