The invention provides a filter device. The filter device comprises a filtering part, a constraint part, a bracket part and a connecting part, wherein the filtering part is provided with a first end and a second end opposite to each other, the constraint part can degrade and is at least used for restraining the first end of the filtering part, the bracket part is provided with a first end and a second end opposite to each other, the first end of the bracket part is connected with the second end of the filtering part and the bracket part is arranged coaxial to the filtering part, the connectingpart is arranged on one or more of the first end of the filtering part and the second end of the bracket part and is used for connecting with an external mechanism, and the constraint part is furtherused for restraining the second end of the bracket part when the connecting part is arranged at the second end of the bracket part. The filter device can be taken out from the body and also can realize partial degrading in the body, therefore, the occurrence rate of long-term complications is reduced, and meanwhile, secondary surgery also can be reduced.