Method of solidifying river selimented silt as ceramic construction material

The present invention discloses a method capable of utilizing hydrothermal technique to solidify river sludge and silt and make them into ceramic building materials. Said method includes the following steps: firstly, mixing river sludge and silt with auxiliary raw material containing CaO, and making the mole ratio of CaO and SiO2 in said mixed material be 0.2-1.2, adding water, stirring, forming on pressing machine, finally making hydrothermal treatment so as to obtain hydrothermal ceramic building material.