Portable Steam Washier not only integrates sterilization, water storage and the wall-mounted structure for portability, but also innovates hot steam cleaning without dish soap, consequently reducing the discharge of polluted water. The hot steam cleaning is adjustable via a knob to realize varying degrees of cleaning and sterilization. For higher cleaning efficiency, different replaceable nozzles are provided for users to match corresponding cleaning tasks. Also, the hot steam cleaning can protect users from scalds by rapid downhill cooling after sterilization.