Online sizing and printing equipment of digital printing machine and method thereof

The invention discloses online sizing and printing equipment of a digital printing machine and a method of the online sizing and printing equipment, and relates to the technical field of printing. According to the online sizing and printing equipment of the digital printing machine and the method thereof, through the arrangement of the sizing assembly and the operation of the hydraulic cylinder, the sizing frame and other assemblies, a sizing roller can be driven to downwards make contact with conveyed fabric, meanwhile, the sizing roller is pressed through cooperation of the inner shaft rod and other assemblies to upwards eject out a corresponding sealing plate frame, and therefore the sizing effect is improved. The sealing plate frame moves upwards until the lower sizing tank is flush with the interior of the sizing frame, sizing materials flow to the outer side of the sizing roller through the lower sizing tank, then sizing is conducted through matched rotation of an inner shaft rod and a bearing after the