The invention discloses a roller conveying flexible board grinding and brushing machine. The roller conveying flexible board grinding and brushing machine comprises a case, a damping base, a feeding channel, a flexible circuit board, a first conveying roller, a first grinding and brushing roller, a first water jet cutter, a first lifting mechanism, a first drive motor, a second conveying roller, a second grinding and brushing roller, a second water jet cutter, a second lifting mechanism, a second drive motor, a discharging channel, a water supply circulation tank, a roller swing mechanism, a pressurizer, a hydraulic pump, an energy accumulator, a purifier, a filter net, a PP cotton filter element, an active carbon layer, a water storage tank, a water pump, a water supply controller, a nozzle, a diverter valve, a water collection groove and a circulation pump. According to the roller conveying flexible board grinding and brushing machine, the height of the grinding and brushing rollers can be adjusted vertically through the lifting mechanism at the bottoms of the grinding and brushing rollers, so that the attachment degree between the grinding and brushing rollers and the circuit board is changed; and the grinding and brushing rollers can be driven by a swing mechanism to circularly swing left and right while rotating to conduct grinding and brushing, so that grinding cracks on the surface of the circuit board are more uniform, and the grinding and brushing effects are improved.