The invention provides an acid draining device and method for Baijiu, and relates to the technical field of production of Baijiu. The device comprises a fractionating tower main body, a condensation device, a reducing tank and a liquid collection tank, wherein an inner chamber is formed in the fractionating tower main body; the condensation device is connected with the fractionating tower main body and is used for condensing steam; a heating device which is used for heating and at least one condensing plate which is used for collecting liquid are arranged in the inner chamber; the condensing plates are connected with a temperature control device which is used for controlling the temperature of the condensing plates; the liquid collection tank for collecting liquid accommodated on the condensing plates is arranged at the lower end of each condensing plate. According to the acid draining device and method for the Baijiu provided by the invention, acid substances in the Baijiu can be reduced to ensure that pH of the Baijiu is more close to that of healthy people, so that the harm to the human body can be reduced when people drinks the same amount of Baijiu; meanwhile, the Baijiu subjected to acid drainage has the characteristics that after the Baijiu is drunk, the Baijiu tastes gently in mouth, people feels comfortable after sobering up, the stimulation to the human body is small, and alcohol fumes are not obvious.