Biofilter suitable for sewage treatment of water-network type village ditches

The invention belongs to the technical field of sewage treatment and relates to a biofilter suitable for sewage treatment of water-network type village ditches. The biofilter is divided into ten cells along the length direction thereof by a baffle plate, coarse gravel is placed at the bottom layer of each cell, two layers are arranged on the coarse gravel, five filter material baskets are horizontally placed at each layer, the filter material baskets are filled with home-made nitrogen/phosphorus removal filter material, and plants are planted in the upper-layer filter material basket; the home-made ceramisite filter material is searched and developed through two steps (firing and modification); after the filter material reaches absorption saturation degree, the filter material can be taken out of the filter material baskets; and because of adsorbing nutrient elements such as nitrogen and phosphorus, the filter material is enhanced in fertility, can be agriculturally used as fertilizer or a soil conditioner for non-edible plant, thus achieving the purpose of resource utilization. The biofilter is simple in structure and low in investment, artificial aeration and filter material backwash are not carried out, oxygen is only charged in a natural manner, thus realizing the purposes of no power, no energy consumption and convenient management, and the biofilter is a novel process suitable for sewage treatment of water-network type village ditches in China.