A portable shower garment washer is an apparatus that utilizes existing shower heads to wash garments. The apparatus includes frame assembly, an enclosure, and a washing mechanism. The frame assembly upholds the enclosure and the washing mechanism. The apparatus further includes a length-adjustable fastener that attaches the frame, and consequently the enclosure, with an existing shower head. The apparatus further includes a water supply, from an existing shower head, and the enclosure contains the water from the water supply, as well as soapy water, around the garments positioned within the enclosure. The washing mechanism provides a pre-rinse cycle, a pre-soak cycle, a rinse cycle and a drip cycle within the enclosure. The apparatus is preferably manually operated with valves but may also be automatically operated with actuators. The apparatus may further include a first inflatable bladder and a second inflatable bladder that squeeze the garments in order to facilitate drying.