A deeply sewage treating method and apparatus without sludge discharging is disclosed by means of the physical, chemical and biological methods. Proper sewage treating agent with powerful adsorbing capacity, organic matter decomposing and oxidizing capacity and settling capacity is selected based on the quantity of sewage and pollutant characteristic of the sewage to be treated. Sewage is treated through an integrative function tank that comprises a grille primary tank (1), a settling tank (2), high concentration aeration tank (3), aerobic biological tank (4), anaerobic sludge returning tank (5), a sludge and cleaning water separating tank (6), separating tank (7), and pouring tank (8). Sewage is subjected to physical filtering, chemical regulation of pH value, aerating, biological treatment, settling and filtering, so that organic pollutant is converted into microbe that is oxidized and decomposed into CO2, H2O, NH3 and small amount of excess sludge for inside circulating treatment. The treated water reaches the draining standard.