The invention discloses an outdoor portable and foldable solar showering device easy to dismount and mount and a use method. The outdoor portable and foldable solar showering device easy to dismount and mount comprises a foldable water tank, a hose connected with the foldable water tank and a sprinkler connected with the hose. A detachable solar heater and a spiral plastic plug are installed at the top of the foldable water tank. The spiral plastic plug is used for injecting water in the equipment preparation period and keeping the air outside and inside the tank communicated in the equipment use period. The hose is divided into two sections which are connected with a water inlet end and a water outlet end of a water pump respectively, and the power source of the water pump is batteries. The outdoor portable and foldable solar showering device easy to dismount and mount is mainly used for showering outdoors. When the outdoor portable and foldable solar showering device easy to dismount and mount is not used, the space for carrying the solar showering device is saved through folding, stretching and contracting, and therefore portability is improved. When the outdoor portable and foldable solar showering device easy to dismount and mount needs to be used or stored, through flexible and simple connecting and supporting measures, the performance of rapid mounting and easy dismounting of the device is improved, and the outdoor portable and foldable solar showering device easy to dismount and mount is convenient and fast to use.