The invention relates to a refining purifying device and method used for continuously producing battery grade dimethyl carbonate. The device is characterized in that the top of a light component removal column is connected with an overhead condenser; the overhead condenser is connected with the light component removal column by a first reflux drum and a first reflux pump and is connected with a light component removal outlet; the bottom of the light component removal column is connected with a first reboiler; the first reboiler is used for conveying raw materials subjected to light component removal to a rectifying column via a column reactor pump; the rectifying column is connected with a second reflux drum by a rectifying column condenser; the second reflux drum is connected with the rectifying column by a second reflux pump; the bottom of the separate column reactor is connected with a second column reactor pump by a second reboiler; the middle part of the separate column reactor is connected with a side condenser by a side withdrawing pump. The device and the method have the beneficial effects that the problems of low product purity, low yield, high energy consumption and generation of solid waste pollutants in traditional production processes are solved; the purity of the dimethyl carbonate product is improved 99.99% or more after removing light components by the light component removal column and then carrying out purifying refining by the rectifying column.