The invention provides a construction waste regeneration method. The method comprises the following steps of 1, removing impurities, specifically removing clay, steel materials, wood, plastic and cloth in construction waste to obtain a recycled material; 2, crushing, specifically crushing the recycled material into crushed aggregates with the size of less than 20 mm; 3, extruding, specifically extruding the crushed aggregates to obtain powder with the particle size of less than 80 microns; and 4, carrying out ball milling, specifically feeding the powder into a ball mill for ball milling, controlling the moisture content in the powder to be below 1%, and setting resistance opposite to the flowing direction of the powder in the ball mill to obtain fine powder with specific surface area of 600-1000 m^2/kg. According to the construction waste regeneration method, the obtained fine powder can be applied to admixtures for cement and concrete.