The invention discloses a special fertilizer for excentrodendron hsienmu and a preparation method of the special fertilizer. The special fertilizer is prepared by adopting the following components in parts by weight: 30 to 45 parts of mulberry branch powder, 15 to 25 parts of sugarcane tail, 20 to 25 parts of pond sludge, 10 to 15 parts of compost, 3 to 5 parts of perlite, 2 to 3 parts of chitosan, 3 to 5 parts of zinc sulfate, 1 to 2 parts of manganese sulfate, 0.5 to 1 part of borax, 0.5 to 1 part of ammonium molybdate, 1 to 3 parts of fertilizer activating agent, 2 to 3 parts of injurious insect repellent and 1 to 2 parts of zymophyte. The compost is formed by mixing and composting 30 to 50 parts by weight of cattle manure, 10 to 15 parts by weight of chicken manure and 3 to 5 parts by weight of straw ash for 3 months or more, the compost is overturned once a month, and 0.5 to 1 part by weight of pulverized lime is added while the compost is overturned. By adopting the special fertilizer, the nutrition of the excentrodendron hsienmu during the growth process can be supplemented in time, the content of organic matters in soil also can be increased, the soil environment can be improved, an injurious insect repelling effect also can be realized, the excentrodendron hsienmu grows well after being fertilized, the wood texture is hard, the yield is increased by 15 percent or more, and the economic benefit and social benefit are greatly increased.