Frame assembly structure

A frame assembly structure, comprising:

• a positioning element having an elongate body portion with two ends each extending to form a shoulder portion at a predetermined included angle with respect to the body portion, the shoulder portion having at least a hanger hole, the body portion having at least a through hole centrally, the hanger hole having a round hole, wherein a recess extends from a periphery of the round hole and dents along a shorter axis of the positioning element;
• two lateral panels, wherein hanger nails are disposed at each of two said lateral panels, correspond in position to two said hanger holes of a corresponding one of the two shoulder portions of the positioning element, and correspond in quantity to two said hanger holes, wherein heads of the hanger nails penetrate the round holes of the hanger holes of the positioning element, respectively, in a manner that the recesses receive bodies of the hanger nails to form engagement structures, respectively, in a manner that the recesses receive bodies of the hanger nails to form engagement structures, respectively, wherein two said lateral panels form therebetween a predetermined included angle due to two said shoulder portions of the positioning element;
• and
• a corner post engaged with two said lateral panels and then engaged with the positioning element by passing a fastening element through the at least a through hole centrally disposed at the positioning element.