FILTERING DEVICE

A filtering device includes a base assembly, a valve assembly, a lock assembly and a filter assembly. The valve assembly comprises an end connected to the base assembly and in communication with the input tube and the output tube, and comprises other end formed with an opening. The lock assembly has a groove part. The filter assembly includes an end protruding outwardly to form a connection part, and other end protruding outwardly to form a fastening part. The filter assembly is movably combined in the groove part by connection part, so as to combine with the lock assembly. When the filter assembly is accommodated inside the valve assembly and the lock assembly is combine to the opening, the lock assembly can drive the fastening part of the filter assembly to combine with the base assembly, so as to fix the filter assembly in the valve assembly.