Pervious concrete additive and preparation method thereof

The invention discloses a pervious concrete additive. The pervious concrete additive is prepared from raw materials in parts by weight as follows: 0.5-95 parts of micropowder, 0.2-3 parts of a reinforcing agent, 0.5-1.5 parts of a defoaming agent and 2-10 parts of a viscosity-enhancing and water-retaining agent. The invention further discloses a preparation method of the pervious concrete additive. A large amount of industrial waste is utilized, sources are wide, the cost is low, the prepared pervious concrete effectively reduces cost of a water permeable brick while guaranteeing permeation coefficient and compressive strength, meanwhile, a new path is provided for industrial waste residue treatment, and remarkable economic and social benefits are obtained. The preparation method adopts a simple process, and is easy to operate and high in practicability.