A combined wall panel is composed of a plurality of main body boards. The specific base angle on said main body board wherein longitudinal and transverse grooves are provided at equal distance so as to form a protruding square brace block; a first longitudinal and transverse grooves are provided respectively from said base angle at a translational distance of a second unit length, the last longitudinal and transverse grooves is positioned at a distance of a third unit length to said second long and short sides, while remanding longitudinal and transverse grooves are provided successively at an equal interval of a first unit length between the first longitudinal and transverse grooves and the last longitudinal and transverse grooves; wherein said main body board is provided further from said base angle with longitudinal and transverse splicing joining faces having a fourth unit width, and wherein said main body board is provided further on part of said brace blocks as well as longitudinal and transverse joining faces with through holes penetrating through the thickness of said main body board.
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