The invention provides an economic 
crop belt for 
cutting down pollutants in a 
ditch in an irrigated region. The economic 
crop belt comprises an economic 
crop growing region, a vertical 
weight lifting repair region, a transitional spacer region and fixing piles, wherein the economic crop 
growing region is connected with the vertical 
weight lifting repair region through the transitional spacer region, and the fixing piles are used for fixing the economic crop 
growing region, the vertical 
weight lifting repair region and the transitional spacer region at designated spots on one side of the 
ditch. According to the economic crop belt, organic pollutants and nutritive salt in farmland 
tail water are removed through assimilation and absorption as well as adsorption and consumption of water planting economic crops and light 
ceramic particles in the economic crop growing region as well as biozeolite in the vertical weight lifting repair region, the plants growing in the economic crop belt has 
economic benefits while giving play to ecological benefits simultaneously, the maintaining enthusiasm of farmers can be strengthened, and the generalization performance is strong. During the 
irrigation period, the device can be put away and put on the 
ditch to guarantee the 
water flow speed of the ditch, has the advantages of being low in cost, simple and attractive, economical and environment-friendly, and obvious in effect, and is suitable for 
cutting down the pollutants on a farmland surface source.