Cationic polyelectrolyte type sludge dehydrating agent as well as preparation method and application thereof

The invention provides a preparation method of a cationic polyelectrolyte sludge dehydrating agent, which comprises the following steps: S1, water phase preparation: dissolving an acrylamide solid with water, adding a cationic ester polymeric monomer and a cationic amide polymeric monomer, and mixing at 40-45 DEG C to obtain a water solution; preparing an initiator, adding the initiator into the monomer aqueous solution, and uniformly mixing to prepare a water phase; preparation of an oil phase: in a reaction container, adding surfactants of sorbitan monostearate and sorbitan fatty acid ester, an initiator of azodiisobutyronitrile, and cyclohexane and/or methyl cyclohexane to prepare the oil phase; s3, post-treatment: after the reaction is finished, draining a product, and drying the product in a drying oven to obtain the cationic polyelectrolyte type sludge dehydrating agent. The preparation method has the advantages of safety, simplicity, low cost, convenience in storage and transportation, no generation of