The invention discloses nonferrous mine mullock concrete used as filling and the preparation method thereof, and relates to the concrete which is used for mining backfilling and the preparation method thereof. The preparation method includes the following steps: at first, the mullock is crushed into grains with the diameter being 5 to 30 mm, then the mullock, ore dressing milltailings and fly ashes are adopted to be used as aggregate according to the weight rate of (5 to 7):(4 to 6):(0 to 3), and cement is adopted according to the weight rate (7 to 11): 1 part of the cement, then admixture is adopted with the weight of 0.3 to 1.5 percent of the cement. Then the aggregate, the cement, the admixture and mining wastewater are put into an agitator to agitate and make mortar with 65 to 88 percent of weight percentage concentration, then the mortar is cast and molded to be mullock concrete on the spot, or a mortar pump is sent to the site of the backfill mine, then cast and moulded to be the mullock concrete. Through detecting, the mullock concrete satisfies the strength requirement that R3 is equal to or larger than 1.5 MPa, R7 is equal to or larger than 2.5 MPa, R28 is equal to or larger than 5.0 MPa, the slump is equal to or larger than 22 cm, and the horizontal distance is equal to or larger than 500 m, and the height is equal to or larger than 30 m. The invention has the advantages of saving material by 10 to 20 percent, recycling the mullock and reducing the mine construction cost, thereby having obvious economic and environmental benefits.