The invention discloses a conveying platform in a sealing and cutting device of which the notch of the sealing blade can be opened or closed, comprising a front bedplate and a rear bedplate of which surfaces are level, wherein, the notch of the sealing blade is arranged between the front bedplate and the rear bedplate; the front bedplate is composed of a fixed plate and a movable plate embedded together in a movable manner; the middle part of the bottom surface of the fixed plate is hinged with a driving air cylinder; the piston rod of the driving cylinder is fixed on the bottom surface of the movable plate; the two sides of the bottom surface of the fixed plate are respectively provided with a guide holder; a pair of the guide holders are movably provided with a pair of guide rods in parallel with each other; and the end parts of the guide rods are fixed on the bottom surface of the movable plate. The conveying platform greatly broadens application range of the whole sealing and cutting device.