The invention belongs to the technical field of copper-clad plate production and particularly relates to a preparation method of a halogen-free, non-phosphorus, environment-friendly flame-retardant composite matrix copper-clad plate. According to the invention, two new nitrogen-containing phenolic resins are fully utilized in coordination with other fillers to ensure the flame retardance, machinability and other basic properties of the copper-clad plate, where nitrogen-containing phenolic resin A has the characteristics of high nitrogen content, low molecular weight and intersolubility with water in any ratio, and nitrogen-containing phenolic resin B has the characteristics of high nitrogen content and good flexibility. The copper-clad plate produced according to the invention has the following halogen content: less than or equal to 0.09% of nitrogen, less than or equal to 0.09% of bromine, or less than or equal to 0.15% in total of nitrogen and bromine, thus meeting the halogen-free requirement, and has no any phosphorus compound added therein with a phosphorus content of less than or equal to 0.1%. The copper-clad plate produced according to the invention has flame retardance meeting the requirement of FV0 grade and achieves no halogen, no phosphorus and environmental protection with reduced cost and significantly improved heat resistance.