The invention discloses a capsicum soilless culture matrix for preventing and controlling insect diseases and belongs to the technical field of soilless culture. The capsicum soilless culture matrix comprises, by weight, 200-400 parts of turf, 25-80 parts of perlite, 10-25 parts of vermiculite, 10-25 parts of biogas residues, 5-10 parts of wood chips, 2-4 parts of EM composite inocula, 1-5 parts of a trichoderma sp. agent, 15-30 parts of brown coal, 2-8 parts of walnut shell powder, 3-7 parts of husk ash, 1-3 parts of brown sugar, 1-3 parts of gypsum, 10-15 parts of chicken manure, 100-150 parts of cassava slag, 30-65 parts of humus soil, 1-3 parts of carbendazim and 2-5 parts of szechwan Chinaberry fruits. The capsicum soilless culture matrix is rich in nutrients, reduces capsicum insect diseases and provides a good root environment for capsicum growth.