Baffling high-efficiency bio-filter apparatus

The utility model provides a deflection high-efficiency biological filter tank which is rectangular and is provided with a plurality of transversal overflow partition walls, wherein one end of each transversal overflow partition wall is connected with a tank wall, and the other end is at a certain distance from the opposite tank wall; the bottoms the transversal overflow partition walls are connected with a tank bottom, and two adjacent stages of transversal overflow partition walls are crossed and arranged left and right; the first-stage overflow partition is opposite to a water inlet, the final-stage overflow partition is opposite to a water outlet, and the transversal overflow partition walls are zigzagged left and right; a plurality of longitudinal overflow partition walls are additionally arranged in a space separated by each stage of partition wall, and both ends of each longitudinal overflow partition wall are connected with the transversal overflow partition walls or tank walls; overflow partitions are staggered at the bottom or the upper ends of two adjacent longitudinal overflow partition walls, and the other end of either longitudinal partition wall is level with the upper ends of the tank walls or is connected with the bottom; the overflow partition of the first longitudinal overflow partition wall is opposite to the water inlet, the final stage is opposite to the water outlet, and the overflow partitions are staggered in an N shape up and down in each stage of space. The utility model has the advantages of simple structure, scientific design, space saving, cost saving, economy and practicability and is suitable for wide popularization.