A wall mounting bath accessory assembly contains: a fixing mount and a base. The fixing mount includes an inner fence, an outer fence, two peripheral fences, and two through orifices. The inner fence faces to an external face of a wall, each peripheral fence has a flexible wing, and between two free segments of two flexible wings of the two peripheral fences is defined a movable portion. The fixing mount also includes a first locking portion, and the movable portion has a second locking portion opposite to the first locking portion. The base includes a first hooking portion and a second hooking portion, wherein the second hooking portion is hooked with the second locking portion of the movable portion.