Rotary suction device

A rotary suction device, comprising:

• a suction disk comprising a base and a soft disk connected to the base, wherein the base comprises a peripheral wall, at least a guide block protruding from the peripheral wall, at least an inclined surface being on the peripheral wall, and a central circular trough being in an inner side of the base;
• a middle cover comprising a central through hole being correspondingly around the peripheral wall and at least a guide trough extending outwardly from the central through hole, wherein the at least a guide trough is correspondingly around the at least a guide block, and the middle cover is capable of axial displacement relative to the suction disk;
• and
• an upper cover comprising a central pivot, at least a sliding block protruding from the central pivot, and an elastic component, wherein the central pivot is correspondingly accommodated in the central circular trough, the upper cover is capable of rotating relative to the suction disk, the elastic component is between and is respectively against the upper cover and the suction disk, and the at least a sliding block is forced to against the at least an inclined surface by being applied an elastic force from the elastic component.