The invention provides a pressurizing grouting method utilizing an air bag blockage device. The method includes the steps that the air bag blockage device is mounted at the end of a soil nail or the end of an anchor rod, then the air bag blockage device is inflated to block a hole opening, and hole bottom pressurizing grouting is conducted in the soil nail or the anchor rod, so that poured pulp is in tight contact with the side wall of a formed hole; and after the poured pulp is solidified, air in the air bag blockage device can be exhausted to be recycled and reused. By the adoption of the pressurizing grouting method, the soil nail grouting effect or anchor rod grouting effect can be improved, and pulling resistance is improved; and meanwhile, after the poured pulp is solidified, the air bag blockage device can be recycled and reused after the air in the air bag blockage device is exhausted. The grouting method plays a substantial role in improving grouting quality of the soil nail or the anchor rod.