Refining kettle for preparing biphenyl dimethyl ether

The invention relates to the technical field of refining kettles, in particular to a refining kettle for preparing biphenyl dimethyl ether, which is convenient for keeping the temperature of heating liquid in an upper heating mantle and a lower heating mantle below the melting point of the biphenyl dimethyl ether, avoids the melting condition of the biphenyl dimethyl ether, reduces the loss of the biphenyl dimethyl ether in the refining process, and improves the yield of the biphenyl dimethyl ether. Comprising a refining kettle body, and a feeding port, a heating mechanism, a stirring mechanism and a discharging mechanism are arranged on the refining kettle body; the feeding hole is formed in the top end of the refining kettle body; the heating mechanism comprises an upper heating cover and a lower heating cover which are fixedly connected to the inner upper side and the inner lower side of the refining kettle body, a plurality of vertically-through first through grooves are formed in the upper heating cover,