The invention discloses a water environment restoration material and a preparation method. Tidal flat soil, honeycomb stone, limestone, zeolite, a steel slag powder and aquatic plant residues are used as raw materials of the restoration material and are prepared to obtain a section bar in the shape of an isosceles right-angle pentahedral triangular pyramidal. The preparation method provided by the invention comprises the following steps of: mixing the above raw materials with the mass ratio of tidal flat soil to The material provided by the invention can be used as the constructed wetland matrix filling material or used for the urban water ecological restoration and water purification of vertical hard bank protecting zone, and simultaneously can help accomplish resource utilization of aquatic plant residues generated during the ecological restoration process.