The invention provides high-precision clean developing liquid for a PCB (printed circuit board), and relates to the technical field of PCB dry film and solder resistant ink developing. By aiming at precise routes (L/S=1.5/1.5mil, 2/2mil and 3/3mil) of HDI, FPC and the like, special cosmetics for developing processing procedures matched with high-end equipment after the exposure are invented, so that the final realization of the circuit design pattern manufacturing is reached. Through the addition of surfactants and latent solvents, the seepage performance and dissolution performance of the developing liquid on photoresists are improved; the chemical reaction is promoted, so that the propulsion the developing process is accelerated; dispersing agents and antioxidants are added for stabilizing tank liquid; bubbles and residues are reduced; the defects after the development are obviously reduced. The high-precision clean developing liquid has the beneficial effects that good image resolution degree is realized; the line quality is improved; in the developing process, carboxylic sodium residues do not exist; the quality of the circuit board is improved; the service life of the medicineliquid is 3 to 10 times of the developing liquid; the waste liquid quantity is small; floating slags are few; the sweeping efficiency is improved; the operation performance is good; the medicine liquid is water-soluble medicine liquid; the dissolution speed is high; the operation is convenient and fast.