Rice low-temperature cold injury breeding test device and use method thereof

A rice low-temperature cold injury breeding test device comprises a fixed box and seedling trays located on the periphery of the fixed box. A cold air fan is arranged in the center of the fixed box, fixed air openings are formed in the four side faces of the fixed box, and rotating discs are arranged at the four corners of the fixed box. Seedling tray air ports are formed in four side surfaces of the seedling tray; the seedling tray air ports are matched with the fixed air ports in shape and can be mutually inserted and fixed with the fixed air ports; the four seedling trays are respectively positioned on the four side surfaces of the fixed box through the rotary tables at the four corners of the fixed box; the four rotating discs synchronously rotate in the same direction, the seedling trays can be rotated to the adjacent side of the fixed box, it is guaranteed that rice test plants in each seedling tray can evenly receive low-temperature cold wind environment simulation, and the stability of a low-temperatu