The invention relates to a protection structure for preventing ground heave caused by tunnel grouting reinforcement. According to the technical scheme, the protection structure includes a tunnel bodylocated below a stratum surface, a reversed arch formed by ground grouting is arranged in stratum over the tunnel body, the reversed arch is shaped like a downward-raised arch, a supporting structureis arranged on a top slope of the inner contour of the tunnel body and surrounds the top slope of the inner contour of the tunnel body, a forward arch formed by hole grouting is arranged on the outerside of the supporting structure, and the forward arch is shaped like an upward-raised arch. According to the protection structure, a stress carrier is formed jointly through multi-layer multiple grouting and by combining multiple passive support modes, reversed arch and positive arch structures are successively formed, the stress distribution states of loose rock and soil layers such as loose rock layers and loose sand oil layers around a tunnel are changed, so high-pressure grouting can be formed through protection of the reversed arch under the situation that the surrounding environment androck and soil property are not mastered very accurately.