The invention discloses a reversing valve structure and piston components thereof. Each piston component comprises a piston gasket (1), a middle component and piston pressing pieces (4) which are arranged in sequence, wherein each middle component is provided with one connection through hole portion, and each piston gasket (1) is connected with the corresponding piston pressing pieces (4) in a welded manner through the corresponding connection through hole portion. According to the piston components provided by the invention, by means of the manner that piston cups and piston spring pieces aremachined with the connection through hole portions, the piston gaskets and the corresponding piston pressing pieces are made to be capable of penetrating through the corresponding connection throughhole portions to contact with each other, and then welding between the piston gaskets and the corresponding piston pressing pieces is facilitated, the arrangements of rivets, bolts and other connection components are avoided, the number of parts of the piston components is reduced, and then the structures of the piston components are effectively simplified; and sealing pairs existing at positionswherein the connection components are in are also avoided, so that the number of hidden danger points of sealing failure is reduced, and the sealing reliability of the piston components in the use process is effectively improved.