Rapid diversion tunnel plugging structure and plugging method thereof

The invention discloses a rapid diversion tunnel plugging structure capable of shortening construction period. The rapid diversion tunnel plugging structure comprises a diversion tunnel and a plugging body, wherein the diversion tunnel comprises a straight tunnel section and a wedge body section; the plugging body comprises a temporary plug and a permanent plug; the temporary plug is positioned between the permanent plug and a water inlet of the diversion tunnel; and the permanent plug consists of an initial water storage plug positioned on the lower part and a normal water storage plug positioned on the upper part. The permanent plug is divided into the initial water storage plug and the normal water storage plug, so that the permanent plug can be constructed in two stages respectively, namely, initial water storage begins after the temporary plug and the initial water storage plug are constructed by pouring, during initial water storage, the normal water storage plug can be constructed by pouring, through the structure, initial water storage can be carried out in advance, the diversion tunnel is plugged rapidly under the condition of high water head, and initial power generation of a first unit of a hydropower station is implemented ahead of time.