The invention belongs to the technical field of seamless tank printing and particularly relates to a novel multifunctional seamless tank printing device. The novel multifunctional seamless tank printing device comprises a device body and further comprises ink feeding units, cylinder bodies, a rubber roller, lining cloth, plastic dies, core rods, a rotary disc, a power unit and a controller, wherein the ink feeding units, the cylinder bodies, the rubber roller, the lining cloth, the plastic dies, the core rods, the rotary disc, the power unit and the controller are installed on the device body.The controller is used for controlling work of the printing device. The cylinder bodies are installed on the ink feeding units, and the ink feeding units are used for feeding ink for the cylinder bodies. The rubber roller is rotationally arranged on the device body and is detachably provided with the plastic dies used in cooperation with the cylinder bodies. By adjusting stretching and contracting of air cylinders, the shape of an elastic ring can be changed, and therefore the shape of the rubber ring can be adjusted to be the same with that of a seamless tank, printing of the special-shapedseamless tank is achieved, meanwhile, the cylinder bodies do not need to be replaced, the printing efficiency is improved, and the printing cost on the special-shaped seamless tank is reduced.