A high-performance environment-friendly kraft liner board, comprising a bottom layer, a top layer and a coating layer, which are arranged successively in an order from bottom to top; wherein: the bottom layer is made of a bottom layer pulp composed of a modified wood powdery pulp and a short fiber pulp; the top layer is made of a top layer pulp composed of a long fiber pulp and a short fiber pulp; the coating layer is formed through coating a flame retardant styrene-acrylic latex on the top layer; the long fiber pulp and the short fiber pulp are formed through pulping old domestic corrugated boxes; the flame retardant styrene-acrylic latex consists of modified composite flame retardants, a functional modified styrene-acrylic latex and water; the composite flame retardants are a combination of any two or more of ammonium polyphosphate, polyphosphoester, melamine polyphosphate, zinc borate, aluminium hydroxide, and aluminum phosphate; the modified composite flame retardants are prepared through modifying composite flame retardants with a silane coupling agent; a weight ratio of the modified composite flame retardants to the functional modified styrene-acrylic latex is 1:2.5-3.0; the modified composite flame retardants are prepared through modifying composite flame retardants with a silane coupling agent; the functional modified styrene-acrylic latex is prepared through steps of: according to a proportion, adding dicyclopentenyl methacrylate, water, sodium dodecyl sulfate and nonylphenol polyoxyethylene ether into a reactor 1, stirring evenly; adding trimethylene carbonate, after stirring evenly, successively adding acrylic acid, hydroxyethyl acrylate, butyl acrylate and styrene into reaction system, stirring at a constant speed until mixing well; thereafter, heating the reaction system to 70-90°C, adding sodium bicarbonate and a initiator, under stirring condition, a reaction is carried out at constant temperature for 2-4 hours, upon completion of the reaction, cooling to a room temperature, filtering, adjusting a pH value of an obtained product to neutral, and obtaining the functional modified styrene-acrylic latex, the proportion includes a weight ratio of the dicyclopentenyl methacrylate, the water, the sodium dodecyl sulfate, the nonylphenol polyoxyethylene ether, the trimethylene carbonate, the acrylic acid, the hydroxyethyl acrylate, the butyl acrylate, the styrene, the sodium bicarbonate and the initiator is 1:40-50:0.2-0.3:0.3-0.4:1-1.3:0.2-0.5:4-6: 25-35:25-35:0.2-0.4:0.4-0.6. a weight ratio of the modified composite flame retardants to the functional modified styrene-acrylic latex is 1:2.5-3.0; the modified composite flame retardants are prepared through modifying composite flame retardants with a silane coupling agent; the functional modified styrene-acrylic latex is prepared through steps of: according to a proportion, adding dicyclopentenyl methacrylate, water, sodium dodecyl sulfate and nonylphenol polyoxyethylene ether into a reactor 1, stirring evenly; adding trimethylene carbonate, after stirring evenly, successively adding acrylic acid, hydroxyethyl acrylate, butyl acrylate and styrene into reaction system, stirring at a constant speed until mixing well; thereafter, heating the reaction system to 70-90°C, adding sodium bicarbonate and a initiator, under stirring condition, a reaction is carried out at constant temperature for 2-4 hours, upon completion of the reaction, cooling to a room temperature, filtering, adjusting a pH value of an obtained product to neutral, and obtaining the functional modified styrene-acrylic latex, the proportion includes a weight ratio of the dicyclopentenyl methacrylate, the water, the sodium dodecyl sulfate, the nonylphenol polyoxyethylene ether, the trimethylene carbonate, the acrylic acid, the hydroxyethyl acrylate, the butyl acrylate, the styrene, the sodium bicarbonate and the initiator is 1:40-50:0.2-0.3:0.3-0.4:1-1.3:0.2-0.5:4-6: 25-35:25-35:0.2-0.4:0.4-0.6. <EOS>