Method for refining and utilizing circuit board electrotinning cylinder wastewater

The invention discloses a method for refining and utilizing circuit board electrotinning cylinder wastewater, which comprises the following steps of: feeding tinning wastewater into a wastewater treatment tank through water feeding equipment, adding electrolyte into the wastewater treatment tank, electrifying a cathode and an anode in the wastewater treatment tank, starting a cooling device at the same time, and electrolyzing tin ions to be less than or equal to 1g/L; according to the method, tin ions in the tin electroplating waste liquid are converted into metal tin sheets in an electrolysis mode through manufacturing of an electrolysis recovery system, the metal tin sheets are separated from the tin electroplating waste liquid, then the metal tin sheets are discharged through water outlet equipment, new tin electroplating waste liquid is fed through water feeding equipment, electrolysis treatment is carried out again, and after the steps are repeated for 3-5 days, the tin layer on the surface of a cathode