Bottom blow-down device of prawn culture pond

The utility model discloses a bottom blow-down device of a prawn culture pond, which comprises a blow-down pipeline and a blow-down well at the bottom of the culture pond; the blow-down pipeline at the bottom of the culture pond comprises at least a central blow-down pipe and a plurality of blow-down collecting pipes; and the collecting pipes are paved at the bottom of the pond and lined around the central blow-down pipe in a radiated shape to collect the sewage into the central blow-down pipe, and the central blow-down pipe is connected with the blow-down well. The device can conveniently and quickly absorb the sewage at the bottom of the culture pond so that the culture personnel do not need to enter the bottom of the pond to clear the sewage in person, the structure is simple and the sewage absorption effect is good.