Provided are a greening energy-saving anti-haze formaldehyde-removing space-efficient window sill structure and an application method. The structure is formed by a window (1), a sill, a protective guard (2), an exhaust ventilating fan (7), a far infrared heating device (8), a table board (3), a sofa, a cabinet, a water container (5), a water pump, a time switch, a water supply pipe and a drain pipe, flower and plant planting pipe pores (6), an insect repellent material, and a water quality purification material. Through automatic water supply and automatic overflow on the upper surface of the inner side of a wall hole (4) or on the periphery of the protective guard (2), large quantity of flowers and plants are planted. Through improvement of structures of the window (1) sill and the protective guard (2), and through installing the water container, the fan (7), the table board (3), the sofa, and the far infrared heating device (8), and implementation of measures of dehumidification and damp prevention, insect repellent, water quality stinking prevention, the structure realizes greening and beautification, air purification, and energy-saving and consumption reduction functions, and can resist haze and remove formaldehyde. The structure effectively expands and saves space, and has good market prospect and social benefits.