The invention discloses a wall-mounted air filter. The wall-mounted air filter comprises a wall and an inclined plate, the right side of the wall is fixedly connected with the inclined plate, and a pull device is arranged on the upper surface of the inclined plate. According to the wall-mounted air filter, the occupied area of the device is reduced through the mutual cooperation between the structures of the inclined plate, the wall, a box body, a first L-shaped plate, a second L-shaped plate and the like, and the practical effect is better; through the mutual cooperation between the structures of a handle, an arc plate, a first transverse plate, the box body, a first concave plate and the like, the internal cleaning of the filter can be more convenient, the labor force is saved, and the time is shortened; and through the mutual cooperation between the structures such as an activated carbon filter layer, a PM2.5 filter layer, an HEPA filter layer, a fan, a second concave plate and a negative ion generator, the device can better filter air, so that the filtration effect is improved.