Wet-mixed plastering mortar prepared from stone chips and tailing sand

The invention discloses wet-mixed plastering mortar prepared from stone chips and tailing sand. The wet-mixed plastering mortar comprises the following components in parts by weight: 18-22 parts of cement, 6-8 parts of coal ash, 5-7 parts of mineral powder, 22-25 parts of water, 100-125 parts of the stone chips, 20-35 parts of the tailing sand and 0.5-1.5 parts of a mortar additive, wherein the particle sizes of the stone chips are not greater than 4.75 mm and the stone chips comprise 2-3% of stone powder; the particle size of the tailing sand is not greater than 2.36 mm and the tailing sand comprises 5-10% of mud; the mortar additive is a thickener and comprises the following components in parts by weight: 2-4 parts of a sulfonic acid air entraining agent, 20-40 parts of a naphthalene water reducer, 2-6 parts of sodium gluconate, 0.5-2 parts of polypropylene staple fibers, 5-10 parts of latex powder and 20-40 parts of sodium bentonite. The stone chips and the tailing sand are adopted for replacing machine-made sand and river sand, so that the environmental pollution caused by waste stone chips and tailing sand is alleviated and the production cost of the mortar is reduced.