The present application relates to the technical field of spraying device, and specifically discloses a
sewage treatment agent solution spraying device for
sewage treatment, which comprises a backflushing switching device, the backflushing switching device comprises a base, a cover plate, a fixing rod, a spray head and a flow guide plate, a spraying opening is formed in one side of the base, a first liquid
discharge opening is formed in the base, the cover plate is arranged at the gap of the base, the cover plate and the base jointly form a rotatable
column structure, the fixing rod is arranged at the axis position of the
column structure formed by the base and the cover plate, the base and the cover plate can rotate relative to the fixing rod, and the spray head is arranged on the fixing rod; the base and the cover plate in the backflushing switching device can rotate relative to the fixing rod, so that the spray head can be switched between the spraying position and the backflushing position; when in the spraying position, the spray head sprays the agent solution outward through the spraying opening; when in the backflushing position, the
pressure solution can enter from the side of the output end of the spray head to reversely flush the spray head, so that the cleaning effect of the spray head is improved.