Portable full hydraulic drilling rigs are widely used in green exploration drilling. There is no matching mud purification equipment due to the influence of the mud drilling process and the footing area of portable drilling rigs, leading to some problems, such as waste of water resources, lack of environmental treatment of waste mud. Through comprehensive analysis of various mud purification methods, the miniature high frequency double-layer circular screen shaker was put forward to purify mud, which provided good peformance, and was economic and practical, meeting the requirements of green exploration.