Automatic dosing system is integrated unit which consists of fluids tank, agitator, metering pump, Y-shaped filter, magnetic valve, check valve, pulse damper, water gauge, pressure gauge, control cabinet, and skid-mounted. It will work after completely connecting to chemical feed pipe and electricity power. During running, PH levels of fluid will be detected, corresponding material will be added automatically. This factory type gathering system reduces the workload of designing and operation at working site greatly. This design effectively ensures high quality, safety and stable operation and realize unattended.