Humidifying structure and cooling and heating unit

The humidification structure comprises a shell, a humidification assembly and an airflow driving assembly, and the interior of the shell comprises a first inner wall and a second inner wall which are oppositely arranged; the humidifying assembly is installed in the shell, a first air channel is formed between the humidifying assembly and the first inner wall, and a second air channel is formed between the humidifying assembly and the second inner wall; the humidifying assembly comprises a water receiving piece and a humidifying piece, the humidifying piece is arranged in the water receiving piece, the horizontal distance of the water receiving piece is b, the maximum horizontal distance of the first air channel is x, the maximum horizontal distance of the second air channel is y, the horizontal distance between the first inner wall and the second inner wall is L, L = x + y + b, x + y = 0.44 L, and x is larger than y; and the airflow driving assembly is mounted above the humidifying part. Through the reasonabl