Flat voice coil motor

The utility model discloses a flat voice coil motor, which relates to the technical field of voice coil motors, and is characterized by comprising an integrated E-shaped back iron, the E-shaped back iron comprises a first rectangular back iron, a second rectangular back iron, a third rectangular back iron and a supporting back iron which are sequentially arranged from top to bottom, the supporting back iron is used for connecting the first rectangular back iron, the second rectangular back iron and the third rectangular back iron, and permanent magnets are respectively arranged at opposite positions of the first rectangular back iron and the second rectangular back iron; a rotor is arranged between the two permanent magnets, a concave cavity for the second rectangular back iron to extend into is formed in the rotor, the rotor is arranged on the second rectangular back iron in a sliding and sleeving mode, and the second rectangular back iron is not in contact with the inner side wall of the concave cavity. The