The invention provides a metamorphic marble powder grouting material and a preparation method thereof and relates to the technical field of building materials. The metamorphic marble powder grouting material is prepared from the following raw materials in parts by weight: 50-70 parts of cement, 30-50 parts of sand, 40-60 parts of marble powder, 5-15 parts of resin, 1-3 parts of a curing agent, 1-3parts of an expanding agent, 1-3 parts of a coagulant and 1-3 parts of a water retaining agent. The grouting material is readily available in raw materials and low in cost, has the characteristics ofhigh strength, excellent adhesiveness, impact and stretching resistance and cracking resistance, and has good effects at reinforcing cracks or connecting points and other small parts. A preparation method of the metamorphic marble powder grouting material comprises a step of mixing the raw materials and water. The method is simple in preparation process, high in controllability and suitable for large-scale production.