The invention provides a polyester resin extruding light-emitting plate and a preparation method thereof. The polyester resin extruding light-emitting plate comprises the following components in percentage by weight: 60%-90% of thermoplastic polyester resin, 3%-15% of light-emitting agents, 5%-35% of high-refractive index superfine hollow glass microspheres, 1%-5% of silane coupling agents and 0.5%-4% of octadecanamide lubricating agents, wherein the thermoplastic polyester resin is polyethylene terephthalate; and the light-emitting agents are aluminate and/or silicate light-emitting agents activated by using rare-earth. The polyester resin extruding light-emitting plate provided by the invention overcomes the defects of the prior art, is optimized in formula component and reduced in cost, is a high-brightness and long-afterglow novel environment-friendly energy-saving product, has the characteristics of excellent light absorption, light storage and self illumination, has the advantages of good physical and chemical property, flame retardancy, weather resistance, corrosion resistance, nontoxicity, harmlessness and no radiation, greatly enhances the light-emitting brightness, greatly prolongs the afterglow time, has good cost advantage, can be produced on a large scale, is energy-saving and environment-friendly and wide in application range and has excellent social and economic value.