The schematic diagram of filter element filtration and backwashing of multi filter element automatic backwash filter is a filter element. In filtration, the original (sewage) is filtered from the inside of the filter element to the outside, and the suspended solids in the water are intercepted and floated in the filter element, and the filtered water flows out of the clearance plane through the clearance hole at the V-shaped end. When the hole of the filter element is blocked by a large amount of suspended solids, the pressure difference between the inlet and outlet of the filter element increases, and backwashing starts, that is, the filter element is in backwashing. When flushing the filter element from the outside, the reverse pressure of the filter element from the outside to the outside is larger. Since the gap is V-shaped, the backwash water enters from the outside of the filter element. As a result, the cleaning effect will be greatly improved when the flow rate is large. The high-quality filter element with V-shaped end face outward has excellent fluid characteristics. Each automatic cleaning makes the automatic backwash filter element successful, thus ensuring the long-term stable operation of the automatic backwash filter element.