Municipal reservoir purification system

The invention relates to a municipal reservoir purification system which sequentially comprises a desilting sedimentation tank for removing silt and suspended solids, a purification tank and a disinfection tank, a purifying agent is added into the purification tank, and the purifying agent comprises the following components in parts by weight in per liter of water: 40-50 parts of hydroxyethyl methylacrylate; 8 to 10 parts of bismaleimide; 1 to 2 parts of glycidyl ether; 1 to 2 parts of ZXC700 boron selective chelating resin; and 10-12 parts of a dispersant. The municipal reservoir purification system has the following advantages and effects: hydroxyethyl methylacrylate and bismaleimide react under the action of glycidyl ether to obtain a product with active groups, and the product can chemically react with organic matters in water to cause an unstable state of colloidal particles and generate a netting effect, so that the colloidal particles are promoted to agglutinate and sink; a good flocculation effect is