The cleaning of hard surface attachments, crevice contaminants and fracture contaminants is a technical difficulty for the conservation of unearthed porcelain. Current mechanical, chemical, ultrasonic and steam cleaning methods have their respective limitations. In this research, micro-nano bubble cleaning was applied to unearthed porcelain from Qinglong Town, and its safety performance and cleaning effectiveness were evaluated. Colorimetric, gloss and microscopic analysis of the glaze and microscopic measurement of crevices were used on the Qinglong Town samples and imitated porcelain samples, and showed that micro-nano bubble cleaning was a safe technique. Micro-nano bubble cleaning was compared with ultrasonic cleaning and steam cleaning so as to evaluate the effectiveness of cleaning of surface attachments, crevice contaminants, fracture contaminants and sites of metal erosion, and showed that micro-nano bubble cleaning was an effective method.