The invention relates to a boost-type tire on-line vulcanizing device, belonging to the field of tire production machinery. The device is provided with a tilting tire unloading roll table; the upper surface of the tire unloading roll table is provided with a row of free rollers, the middle part and the lower part of the side surface of the tire unloading roll table are fixed with a driven chain wheel and a driving chain wheel respectively by a driven chain wheel rotation shaft and a driving chain wheel rotation shaft, the transmission between the driven chain wheel and the driving chain wheelis realized by a transmission chain, one end of an L-shaped boost swing rod is fixed on the driven chain wheel shaft, one end of an L-shaped tire stopping device is fixed on the driving chain wheel shaft, one end of a telescopic link of a cylinder is connected with the tire stopping device in a hinge way, and the other end of the cylinder is installed on the lower side surface of the tire unloading roll table. The device has good on-line effect, reduces crushing and bruises to the tire, lowers the labor intensity and has simple structure.