The invention relates to a PCB washing mechanism capable of realizing automatic taking and transferring. The PCB washing mechanism comprises a rack and a distribution control box. A conveying trough cooperating with a PCB product is formed in the rack; a washing tin-brushing device and a baking device that cooperate with the product arranged above the washing tin-brushing device and the baking device are arranged below the conveying trough successively; a feeding device cooperating with the product arranged above the feeding device is arranged above the conveying trough; and the tail end of the conveying trough is in a butt joint with a drying device of the product by a cooperative overturning and transferring device. The washing tin-brushing device consists of a brush motor and a brush rotating cylinder, wherein the brush motor and the brush rotating cylinder are arranged at the rack and cooperate with each other; and a brush cooperating with the product at the conveying trough sleeves the brush rotating cylinder. According to the PCB washing mechanism, on the basis of cooperation of the conveying trough with the feeding device, feeding of a PCB is realized; automatic material taking and transferring are realized by the overturning and transferring device at the tail end of the conveying trough, so that the PCB taking and transferring efficiency can be improved; and a scratch caused by manual taking and placing can be avoided, so that the yield of the PCB after washing can be guaranteed.