Uniform liquid supply device and adjusting method

The invention discloses a uniform liquid supply device and an adjusting method. The uniform liquid supply device comprises a liquid inlet pipe, a control cylinder body, a liquid outlet control valve and a liquid outlet pipe, the liquid inlet pipe is provided with a branch as a cylinder body liquid inlet pipe, and the liquid outlet pipe is provided with a branch as a cylinder body liquid outlet pipe; the top of the control cylinder is connected with a cylinder liquid inlet pipe, the bottom is connected with a cylinder liquid outlet pipe, and the upper part is connected with a liquid inlet pipe and a liquid outlet pipe; the control cylinder body comprises a cylinder shell and a cylinder groove; the cylinder groove is movably formed in the cylinder shell; a double-end plug nozzle is vertically arranged in the cylinder groove; wherein the cylinder groove moves up and down to open and close the liquid inlet pipe and the liquid outlet pipe, and the double-head plug nozzle opens and closes the cylinder body liquid i