The invention discloses a method for preventing longicorn stem borers of a camellia oleifera abel forest. The method comprises the following steps: carrying out prevention in an egg stage, a larval phase and a pupal stage of larvae or adults wintering in host plant roots and stems or in suffered trunks, and during the time from December to January of next year when fertilizers are applied to the wintering period; adding nicotine or an organic compound fertilizer accommodating nicotine complexing agent components into a base fertilizer or an additional fertilizer of camellia oleifera abel; directly applying the base fertilizer into a planting hole; directly applying the additional fertilizer to the periphery of a tree body in a manner of spreading, and digging up soils to cover the fertilizer. The method is simple, goal-oriented, strong in operability, environment-friendly, effective and practical, can effectively and directly carry out prevention in the occurrence period of the longicorn stem borers, prevents the stem borers from damaging the trunks and the stems of the camellia oleifera abel forest, reduces the risk of insect damage occurrence to a certain degree, effectively restrains the risks of yield declining and quality deterioration caused by insect damage, guarantees the health, yield and quality of the camellia oleifera abel forest and has good economic benefits, social benefits and ecological benefits.