Wastewater filter for efficient removal of ammonia nitrogen

The invention discloses a wastewater filter for efficient removal of ammonia nitrogen. The wastewater filter comprises a device housing and a secondary filtering tank; a filtering layer is arranged inside the device housing; the upper end of the device housing is provided with a water inlet pipe and a backwashing water outlet pipe which are communicated with the interior of the device housing; a backwashing drainage sluice valve is arranged on the backwashing water outlet pipe; the lower end of the device housing is provided with a backwashing header pipe and a filtered water outlet pipe whichare communicated with the interior of the device housing; a backwashing water inlet sluice valve and a backwashing water inlet pump are sequentially arranged on the backwashing header pipe; the end,far away from the device housing, of the filtered water outlet pipe is communicated with the bottom of the secondary filtering tank; the secondary filtering tank is also internally provided with a filtering layer; and the uppe