The invention relates to a circuit board wet-processing system, which comprises a wet-processing device and a water-supplying device, wherein the wet-processing device comprises a first secondary rinsing section and a first primary rinsing section, and is used for conveying circuit boards from the first secondary rinsing section to the first primary rinsing section; the water-supplying device comprises a first water storage tank, a second water storage tank, a first water inlet pipe, a first connecting pipeline, a first drainage pipe, a primary water-supplying pipe and a wastewater recovery pipe; the first water inlet pipe is connected between the first primary rinsing section and the primary water-supplying pipe and is used for supplying water to the first primary rinsing section; the second water storage tank is used for collecting the water after rinsing the circuit boards at the first primary rinsing section; the first connecting pipeline is connected between the second water storage tank and the first secondary rinsing section and is used for supplying water in the second water storage tank to the first secondary rinsing section; the first water storage tank is used for collecting the water after rinsing the circuit boards at the first secondary rinsing section; and the first drainage pipe is communicated between the first water storage tank and the wastewater recovery pipe and is used for draining water in the first water storage tank into the wastewater recovery pipe.