The invention relates to a green cover construction method for ecological restoration of an abandoned mine pit side slope. The green cover construction method comprises the steps that the abandoned mine pit side slope is subjected to reinforcement treatment, and grid beams are formed on the side slope; plastic stone frameworks are constructed on the grid beams based on the original ecological condition of a mine pit; a steel wire net is provided, and the plastic stone frameworks are wrapped with the steel wire net; the steel wire net is sprayed with plastic stone cement so that a plastic stone structure can be formed; and the plastic stone structure is subjected to earthing operation and provided with plants so that ecological restoration of the abandoned mine pit can be achieved. According to the green cover construction method for ecological restoration of the abandoned mine pit side slope, the mine pit is subjected to side slope reinforcement by forming the grid beams on the side slope of the mine pit, and the structural stability of the mine pit is ensured; then, the plastic stone frameworks are supported and arranged through the grid beams, and the plastic stone frameworks are designed to be of a structure adapting to shape change of a mine body, so that the formed plastic stone structure is similar to the original ecological condition, and the effect of restoring the ecology of the mine pit is achieved; and furthermore, earthing is conducted, the plants are grown, and the requirements of greenery landscape and ecological restoration of the mine pit are met.