Automatic nitrogen and phosphorus recovery equipment and method for low-concentration aquaculture wastewater

The invention discloses automatic nitrogen and phosphorus recovery equipment for low-concentration aquaculture wastewater, and relates to the technical field of sewage treatment. The water inlet device comprises a first container, and the first container is communicated with the reactor; the alkali adding device comprises a second container, and the second container is communicated with the first container; the magnesium salt adding device comprises a third container, and the third container is communicated with the reactor; an aeration device; the struvite collecting device comprises a struvite pumping pipe, a pump body connected to the struvite pumping pipe and a fourth container used for collecting struvite. According to the invention, the purity of struvite is improved, the recovery of nitrogen and phosphorus in sewage is ensured, automatic collection of struvite is realized, the problem that the operation of a reactor needs to be stopped when struvite is collected by gravity traditionally is avoided, con