Sewage discharge box capable of preventing filter screen from being blocked

The invention discloses a pollution discharge box capable of preventing a filter screen from being blocked, and relates to the technical field of filter screen blockage prevention, and the pollution discharge box comprises a pollution discharge assembly which comprises a pollution discharge box, a cavity formed in the pollution discharge box, and a filter plate arranged in the pollution discharge box; the cleaning assembly comprises a control part arranged on the sewage discharge box, an opening part arranged on the control part and a cleaning part arranged on the control part, the device can be used during shutdown cleaning, the opening part arranged in the water purification cavity can push the filter plate to protrude and deform towards one side of the sewage cavity, the hole diameter of the filter plate is increased, and the filter plate can be cleaned more conveniently. The filter plate is provided with the filter holes I and the filter holes II, so that large impurities can conveniently fall into the se