The portable washer for beverage containers is a hand-carried device for providing clean coffee cups or other beverage containers to a social group where facilities with a large supply of clean containers may not be available. The portable washer includes a self-contained water supply and catch basin for used water, and internal electrical power to drive a plurality of rotary brushes for the mechanical scrubbing of containers. An electrically powered water heating element and water pump are also provided. The brushes are actuated by a pushrod switch extending up from the central rotary brush, the water pump and heater being powered by a separate master switch. Water is pumped through the tubular rotary brush supports to spray hot water from the brushes during washing operations. A removable splash guard and cover are provided. The cover has a carrying handle and external racks for the carriage of beverage containers.