Liquid substance proportional mixing device and proportional mixing method based on liquid substance proportional mixing device

The invention discloses a liquid substance proportional mixing device and a proportional mixing method based on the liquid substance proportional mixing device, and relates to the technical field of liquid substance mixing. The device comprises a stock solution storage tank and a mixing tank, a pipeline A is communicated between the stock solution storage tank and the mixing tank, and a plunger pump is arranged on the pipeline A; a liquid level sensor is arranged in the mixing tank, a water inlet is formed in the top of the mixing tank, and a water inlet valve is arranged on the water inlet; a Y-shaped drainage pipe is arranged at the bottom of the mixing tank, three end parts of the Y-shaped drainage pipe are respectively communicated with the mixing tank, a drainage valve and a hose, and the hose is sequentially provided with a centrifugal pump, a one-way valve, a first filter and a concentration detection module in the liquid flowing direction; a liquid using device is also arranged; the top of the liquid