A germination-accelerating and seedling-hardening box. A box body is surrounded by a bottom wall (10) and side walls (22, 24, 26); grooves (222, 242) are respectively formed on a first side wall (22) and a second side wall (24) disposed along a lengthwise direction of the bottom wall (10); a guard rail (282) connected to the bottom wall (10) and perpendicular to the bottom wall (10) is provided; and a reinforcing rib (14) in the bottom wall mounting groove converges on a columnar structure (12) at the center of the bottom wall. Germination-accelerating and seedling-hardening boxes can be stacked together, thereby occupying a small space. The amount of material used in the germination-accelerating and seedling-hardening box itself is reduced, it is convenient for production personnel to observe the germination and growth of crops in germination-accelerating and seedling-hardening boxes, an internally arranged plug cannot fall out, and the overall strength of the germination-accelerating and seedling-hardening
