This portable automatic car wash handheld spray gun is designed for garden spraying, disinfection and pest control, combining modern engineering technology with efficient spraying functions. It is not only suitable for daily maintenance of home gardening, but also plays an important role in commercial garden care and public health disinfection. The gun is equipped with an advanced automatic spray system with built-in intelligent sensors that can monitor water flow and pressure in real time and automatically adjust according to the user's preset program. This function ensures the consistency and efficiency of the spraying process while reducing the complexity of manual operation. Users can select different spray modes such as low pressure mode, atomization mode and directional spray mode through the built-in digital display to adapt to different types of spraying tasks.