A wall-mounted shower head holding structure includes a suction cup assembly capable of holding a shower head. The suction cup assembly includes a suction cup body and a retractable mechanism. The suction cup body can be retractably held to a front end of a wall-mounted main body through the retractable mechanism. When in use, the shower head is attached to and held at the front end of the suction cup assembly. It is quite convenient for use, and does not affect the use of the shower head.