A shower door assembly, comprising: a stationary frame; a movable frame having an opening; a top frame and a bottom frame; and at least one adjusting assembly, wherein each of the at least one adjusting assembly comprises: an adjusting block located between the stationary frame and the movable frame and receivable in the stationary frame; a fixing block and a fastener; wherein the adjusting block has a slot and the fixing block has a through hole such that the fastener can pass through the through hole and the slot to connect the adjusting block to the fixing block; wherein the adjusting block comprises a base portion received in the stationary frame; characterised in that the fixing block is recevable within the top or bottom frame, in that the adjusting block comprises further an adjusting rod, wherein the slot is provided on the adjusting rod; in that the adjusting rod has an engaging portion and the fixing block has a guiding portion matching with the engaging portion; and in that: the engaging portion is a V-shape edge and the guiding portion is a V-shape groove matching with the V-shape edge; or the engaging portion is an arc-shaped edge and the guiding portion is an arc-shaped groove matching with the arc-shaped edge. a stationary frame; a movable frame having an opening; a top frame and a bottom frame; and at least one adjusting assembly, wherein each of the at least one adjusting assembly comprises: an adjusting block located between the stationary frame and the movable frame and receivable in the stationary frame; a fixing block and a fastener; wherein the adjusting block has a slot and the fixing block has a through hole such that the fastener can pass through the through hole and the slot to connect the adjusting block to the fixing block; wherein the adjusting block comprises a base portion received in the stationary frame; characterised in that the fixing block is recevable within the top or bottom frame, in that the adjusting block comprises further an adjusting rod, wherein an adjusting block located between the stationary frame and the movable frame and receivable in the stationary frame; a fixing block and a fastener; wherein the adjusting block has a slot and the fixing block has a through hole such that the fastener can pass through the through hole and the slot to connect the adjusting block to the fixing block; wherein the adjusting block comprises a base portion received in the stationary frame; characterised in that the fixing block is recevable within the top or bottom frame, in that the adjusting block comprises further an adjusting rod, wherein the slot is provided on the adjusting rod; in that the adjusting rod has an engaging portion and the fixing block has a guiding portion matching with the engaging portion; and in that: the engaging portion is a V-shape edge and the guiding portion is a V-shape groove matching with the V-shape edge; or the engaging portion is an arc-shaped edge and the guiding portion is an arc-shaped groove matching with the arc-shaped edge. the engaging portion is a V-shape edge and the guiding portion is a V-shape groove matching with the V-shape edge; or the engaging portion is an arc-shaped edge and the guiding portion is an arc-shaped groove matching with the arc-shaped edge.