The invention discloses a plastic lifting handle sizing device of a full-automatic carton lifting handle eyeleting machine. The device is composed of a rack, a motor, a motor belt wheel, conveying assemblies and sizing assemblies. The conveying assemblies are two in number and of the same structure, and the sizing assemblies are two in number and of the same structure. The two conveying assemblies and the two sizing assemblies are respectively fixed on the rack in parallel. Each conveying assembly is composed of an upper driving gear, a lower driving gear, an upper driving belt wheel, a lower driving belt wheel, an upper driven belt wheel, a lower driven belt wheel, an upper adjusting wheel and a lower adjusting wheel. Each sizing assembly is composed of a baffle block shaped like an inverted L, an upper sizing block and a lower sizing block. According to the technical scheme, technical problems in plastic lifting handle sizing of the carton lifting handle eyeleting machine are solved, sizing effect is good, automation of the sizing device is achieved, production cost is reduced, production efficiency is improved greatly, and technical demands of plastic carton lifting handles in the sizing process are met.