Device for backflushing filter element of filter

The utility model belongs to the technical field of filter element maintenance, and discloses a filter element back-flushing device which comprises a cage body device, an air inlet enclosure device and an air outlet enclosure device, the cage body device is provided with a first cavity, and a filter element to be treated is arranged in the first cavity; the air inlet enclosing device is connected with the first end part of the cage body device in an enclosing manner, an air inlet hole is formed in the air inlet enclosing device, the air inlet hole is communicated with a cavity of the filter element to be treated, and the air inlet hole can be connected with an external air inlet pipe; the air outlet enclosing device is connected with the second end of the cage body device in an enclosing mode and provided with an air outlet hole, and the air outlet hole is located outside the outer wall of the filter element to be treated and communicated with the first cavity. Compressed gas is pumped into a cavity of the fi