The present invention discloses a magnet composite material based on nano attapulgite clay and a preparation method thereof. The magnet composite material is prepared by using the following raw materials in parts by weight: 65-75 parts of magnetic powder; 10-14 parts of bisphenol A epoxy resin; 3-5 parts of carbon fiber; 6-8 parts of dispersing agent; 2-4 parts of 3-aminopropyltriethoxysilane; and 1-3 parts of triglyceride, wherein the dispersing agent is modified nano attapulgite clay. The preparation method is: placing 60-80 parts by weight of attapulgite clay into a triethylamine solution with a mass fraction of 15-25% for soaking for 3-5 hours, taking out and washing until neutral, drying at 45-55 DEG C to water content being 3-5%; adding 4-6 parts of triethanolamine for evenly mixing, and then adding 3-5 parts of dimercaprol dimercaptopropanol and 1-3 parts of nano-graphite powder for mixed grinding, and obtaining the magnet composite material by screening through a mesh size of 200. The magnet composite material prepared in the present invention is high and stable in inductance value, and has prominent substantial features and notable progress compared with the prior art.