Medium-efficiency air filter capable of being quickly combined

The utility model discloses an intermediate efficiency air filter capable of quickly combining, which comprises a frame body, one side of the frame body is provided with a plurality of mounting grooves, the plurality of mounting grooves are uniformly arranged, the interiors of the mounting grooves are connected with connecting blocks in a sliding manner, the other ends of the connecting blocks are fixedly connected with filter bags, and the filter bags are connected with the connecting blocks in a sliding manner. A communicating opening is formed in the right side of the connecting block and communicates with the frame body. The sliding column is pulled outwards through the twisting block, so that the clamping strip is retracted into the cavity, then the connecting block is inserted into the mounting groove from top to bottom, then the sliding column is pushed through the twisting block, so that the clamping strip is inserted into the vertical groove, the clamping strip enters the twisting groove, and then th