A umbrella sliding assembly, includes a post, a slider, a first pulley, a second pulley and a fixing piece. The post is provided with a first track groove and a second track groove. The slider is arranged on the post. The first or second pulley is rotatably mounted on the slider and arranged in a row along a longitudinal direction of the slider, and extends into the first or second track groove, so that the first or second pulley pulley abuts against an inner wall of the first or second track groove. The fixing piece is mounted on the slider and includes a fixing part matchingly fixed with the post, when the fixing part is matchingly fixed with the post, the slider is fixed to the post, and when the fixing part is separated from the post, the slider is movable along a longitudinal direction of the postumbrella sliding assembly.