A shower door assembly, comprising: a stationary frame, a movable frame having a through hole, and an adjusting assembly (40,50) comprising fixing blocks disposed between the stationary frame and the movable frame and received in the stationary frame, the fixing blocks having a passage with a first rectangular cross-section, and rotating blocks having a rotating part and an adjusting shaft perpendicular to the rotating part; wherein an end of the adjusting shaft remote from the rotating part has a second rectangular cross-section with dimensions identical to the first rectangular cross-section, and an engaging element is disposed on at least one surface of the adjusting shaft, characterised in that the shower door assembly further comprises an upper frame, and a lower frame; the rotating blocks are received in the upper frame and the lower frame respectively; the rotating part is a rotating handle having a length direction; and the shower door assembly has an open state in which the length direction of the rotating handle is perpendicular to a length direction of the movable frame and at least a portion of the rotating handle is disposed outside the upper frame and lower frame, and a close state in which the length direction of the rotating handle is parallel to the length direction of the movable frame and the rotating handle is received in the upper frame and lower frame without any portion projecting outward. a stationary frame, a movable frame having a through hole, and an adjusting assembly (40,50) comprising fixing blocks disposed between the stationary frame and the movable frame and received in the stationary frame, the fixing blocks having a passage with a first rectangular cross-section, and rotating blocks having a rotating part and an adjusting shaft perpendicular to the rotating part; wherein an end of the adjusting shaft remote from the rotating part has a second rectangular cross-section with dimensions identical to the first rectangular cross-section, and an engaging element is disposed on at least one surface of the adjusting shaft, characterised in that fixing blocks disposed between the stationary frame and the movable frame and received in the stationary frame, the fixing blocks having a passage with a first rectangular cross-section, and rotating blocks having a rotating part and an adjusting shaft perpendicular to the rotating part; wherein an end of the adjusting shaft remote from the rotating part has a second rectangular cross-section with dimensions identical to the first rectangular cross-section, and an engaging element is disposed on at least one surface of the adjusting shaft, characterised in that the shower door assembly further comprises an upper frame, and a lower frame; the rotating blocks are received in the upper frame and the lower frame respectively; the rotating part is a rotating handle having a length direction; and the shower door assembly has an open state in which the length direction of the rotating handle is perpendicular to a length direction of the movable frame and at least a portion of the rotating handle is disposed outside the upper frame and lower frame, and a close state in which the length direction of the rotating handle is parallel to the length direction of the movable frame and the rotating handle is received in the upper frame and lower frame without any portion projecting outward.