The invention discloses an environment-friendly packaging box, and belongs to the field of environment-friendly package. The environment-friendly packaging box is characterized in that through the design that an environment-friendly box cover can slide on the upper end of an environment-friendly box boxy, in the process of opening the environment-friendly box cover, rice grains bonded on the innerend of the environment-friendly box cover are blocked by the side wall of the environment-friendly box body, and therefore the rice grains and vegetable pieces are prevented from being scattered andleaked during bringing out, food contained in the environment-friendly box body can be effectively prevented from being accidently splashed, and the experience consumption of a consumer can be greatlyimproved. In addition, a self-heating structure is arranged at the inner bottom end of the environment-friendly box boxy, and is convenient to carry when a user goes out, food in the environment-friendly box body can be heated at any time, the sharp end on the lower end of a tip end screw plug is used for puncturing a liquid storage bag capable of being punctured, normal-temperature tap water inthe liquid storage bag capable of being punctured flows out to have a reaction with CaO powder to generate heat, generated heat can rapidly heat food above a heat insulation heat partition board, thefast food is achieved, the environment-friendly packaging box can be recycled and re-machined, and the environment-friendly energy-saving idea is achieved.