A porous polyurea material may be prepared by polymerization and crosslinking of tetra(4-aminophenyl)methane or tetra(4-aminophenyl)silane with a monomer having two to four isocyanate (—NCO) groups, or by polymerization and crosslinking of tetra(4-isocyanatophenyl)methane or tetra(4-isocyanatophenyl)silane with a monomer having two to four amino groups. The method includes: mixing an organic solution of tetra(4-aminophenyl)methane with an organic solution of a monomer having two to four isocyanate groups; reacting the mixed solution under a nitrogen atmosphere; and drying a semi-solid or solid material formed by gelation of the reaction solution, or adding the reaction solution to a non-solvent before gelation of the reaction solution to form a precipitate, followed by drying, or applying the reaction solution to a substrate before gelation of the reaction solution, followed by drying. The introduction of the monomer having a tetrahedral structure can impart good chemical resistance, heat resistance and durability to the porous polyurea material.