The invention relates to a display module structure and an installing method of the display module structure. The display module structure comprises a plurality of functional boards and an installing frame, wherein the installing frame is defined by a plurality of installing strips in a spliced mode, an installing structure is formed on the inner side face of the installing frame, and the functional boars are fixed in the installing frame through the installing structure. Due to the fact that the installing frame is defined by the installing strips in the spliced mode to install the functional boards, an integrated metal back plate, a front frame and an adhesive frame in the prior art are omitted; in addition, a die for the installing strips is universal, the process that adaptive dies need to be designed according to the sizes of display modules is not needed, the display modules with various dimensions can be matched by cutting the installing strips different in length, the cost is effectively reduced, complete machine cost control of manufacturers is facilitated, and therefore the display module structure has the advantages that the size of the display module can be adjusted at will, and suitability is high.