With the rapid development of the national economy and the rapid advancement of highway construction and the coal energy industry, it is often encountered in subgrade construction that softening and muddy rock layers such as shale are present. Especially in coal mine tunnels, the base plate is mostly mudstone, which can become severely muddy under the action of water and vehicle compaction, greatly affecting the quality of the subgrade and transportation. To solve the problem of mudstone mudification, an efficient mud stabilizer has been developed. The material can be spread on the mudified layer and stirred before being compacted by rolling. After compaction, the solidified body can be directly used as a low-grade highway unpaved road or as a subgrade for high-grade highways. There are no special requirements for the moisture content and particle size of the mudified material, and different proportions of stabilizer can be selected according to the purpose. The strength of the solidified body Id can reach 4MPa.