The invention relates to a geometric structure for a wind and wave resistance square metal net box and a processing method thereof. The geometric structure consists of a net box net piece system and a net box framework system and is characterized in that the net box net piece system adopts the combined net piece form of double-layer synthesis fiber net pieces, metal inclined square nets, verticalsoft connectors and box body bottom square net pieces, the edge length of a bottom square net piece equals to the edge length of an inner frame of a square double-row zinc plating iron pipe framework, the bottom net piece of a box body of the net box is assembled on a square high-density polyethylene pipe framework through a high-intensity rope, the square high-density polyethylene pipe frameworkis connected with a second net piece through a high-intensity rope, and the box body side surface net piece of the net box is connected with the box body bottom net piece of the net box, cylindrical foam floats are distributed under the square double-row zinc plating iron pipe framework of the net box framework system, and the upper frame of the square double-row zinc plating iron pipe framework is connected with an upper head line of a first net piece in the vertical direction of the box body of the net box through a high-intensity rope.