Extraction and filtration method for extracting target object in solid sample

The invention relates to an extraction and filtration method for extracting a target object in a solid sample. The main body of an adopted extraction and filtration device is an extraction bottle, and after the extraction bottle is used for extraction, the extraction bottle is modified into an extraction liquid filtration kit so as to filter an extraction liquid. The extraction bottle comprises a bottle body (4), a first sealing screw cap (1), a second sealing screw cap (8) and a fastening clamp (9), wherein both the upper end and the lower end of the bottle body (4) are open, and a screw cap fastening groove (14) is formed in the outer surface of the second sealing screw cap (8); a bottle opening fastening groove (5) is formed in the outer surface, which is close to the extraction bottle lower screw opening (6), of the lower end of the bottle body (4); and the fastening clamp (9) is in a double-arc shape and comprises a bottle opening arc ring (91) and a screw cap arc ring (92). According to the invention, m