Filter device for assembly type indoor heating ventilation air conditioner indoor unit

The utility model discloses a filter device for an indoor unit of an assembly type indoor heating ventilation air conditioner, which comprises a horizontally arranged casing, a vertically arranged filter screen is arranged in the casing, the lower end of the filter screen extends to the outside of the casing and is fixedly connected with a magnetic plate, and a permanent magnet which is in heteropole attraction with the magnetic plate is fixedly embedded in the inner side wall of the casing. A scraping strip tightly attached to the filter screen is arranged in the machine shell, at least one threaded rod penetrating through the scraping strip is rotationally connected in the machine shell and is in threaded connection with the scraping strip, the bottom end of the threaded rod extends to the outside of the machine shell and is coaxially in threaded connection with an inner threaded rod fixedly connected to the upper side wall of the magnetic plate, and the threaded rod is in transmission connection with a col