The invention discloses a portable pressure equalizing device. The portable pressure equalizing device comprises a rubber inner tube, wherein the diameter of a central hole of the rubber inner tube is 700mm, the surface of the rubber inner tube is covered with copper wire gauze, a crossed support is arranged in the central hole of the rubber inner tube in an abutting supporting mode, connecting holes are formed in each end of the support, the ends of the support and the copper wire gauze are fastened through connecting ropes and the connecting holes, a bolt shaft is arranged in the center of the crossed support, and can be conveniently screwed down and unscrewed, and the surface of the rubber inner tube is coated with silver paste in a brushing mode. Due to the fact that the portable pressure equalizing device is inflatable and foldable, the portable pressure equalizing device is convenient to carry, manpower and materials are saved, and the cost is greatly reduced.