The invention discloses a preparing method of conducting resin for LED packaging, and belongs to the technical field of conducting resin preparation. Polyacrylonitrile fiber is carbonized to prepare a carbon fiber material high in electroconductivity and thermal conductivity, the surface of the carbon fiber material is coated with a layer of nano silver particles through deposition reaction, natural resin lac generated by growth of lac insect and microorganism are used for carrying out surface modification on the carbon fiber coated with silver, resin particles on the surface are increased, the binding force and compatibility between conducting filler and resin are improved, and the modified carbon fiber coated with silver is compounded with epoxy resin to prepare conducting resin; by adding the carbon fiber coated with silver, the shear strength and mechanical performance of the conducting resin are enhanced, the problems that common conducting resin is low in product heat conductivity coefficient, high in volume resistivity, poor in bonding strength and small in shearing strength due to poor compatibility between the conducting filler and the resin-based colloid base material are solved, and the conducting resin has broad application prospects.