Cationic rigid macromonomer, preparation method and toner

The invention provides a cationic rigid macromonomer, a preparation method and toner. According to the invention, a hydrophobic vinyl monomer and a hydrophilic cationic vinyl monomer are used and subjected to free radical polymerization with a solution polymerization method through a free radical polymerization initiator, a polymer provided with a reactive group at the tail end is prepared, then (methyl) acryloyl chloride and (methyl) glycidyl acrylate are used for reacting with the reactive group at the tail end, and a vinyl unsaturated double bonds are introduced to the tail end of the polymer to form the cationic rigid macromonomer. A method for preparing electropositive suspension polymerization toner with a core-shell structure by the cationic rigid macromonomer comprises the steps of preparation of an oil-phase dispersion liquid, preparation of a water-based dispersion liquid, suspension granulation, polymerization reaction, filtering/cleaning, drying, external addition and the like. The obtained toner