The invention relates to a method for extracting and refining a long-chain dicarboxylic acid crude product. The method comprises the following steps that: the filtrate and an extracting agent are mixed and heated, and an acid is added to carry out acidifying; a liquid-liquid separation treatment is performed after the extracting agent and the filtrate are subjected to complete mixing and standing under a certain pH value and a certain temperature; the extraction phase is cooled and crystallized; the solvent is removed, and a drying treatment is performed to obtain the purified product. According to the present invention, the adsorbent is not used, such that the process for separation of the adsorbent and the fermentation liquid is saved so as to substantially reduce the purification process; the method has characteristics of simple purification process, high purification yield, and easy control of the purification process.