Fry screening device for aquaculture

The fry screening device comprises a box body with an opening in the upper end, a partition plate is arranged at the position, close to the bottom of the box body, in the box body, a plurality of sliding grooves are downwards formed in the left side and the right side of the opening end of the box body, and a first screen is slidably connected to the position, between the two corresponding sliding grooves, of the front end of the box body. A through groove is inwards formed in the rear end of the outer wall of the box body, a blocking door is hinged to the lower end of an opening of the through groove, a drainage pipe is communicated with the position, close to the opening, of the rear end of the outer wall of the box body, and water outlet pipes are arranged on the left side and the right side of the front end of the open end of the box body in a matched mode; a water suction pump is installed below the upper end of the partition plate at the bottom of the box body, a water inlet of the water suction pump co