The invention discloses an installation structure of multiple sliding doors. The installation structure of the multiple sliding doors comprises guiderails, hanging wheels and door leaf structures of the sliding doors, and further comprises a sub-frame mechanism. The sub-frame mechanism comprises a sub-frame body, the sub-frame body comprises a top plate, a left-right side plate; the guiderails are mounted in the sub-frame body, the side plate of the sub-frame body expands downwards to form baffles, the hanging wheels are arranged in the guiderails, and hanging wheel mounting blocks used for fixing the sliding doors are arranged downwards from the hanging wheels; hanging wheel weight-bearing grooves are formed in the upper end face of an upper frame body profile of the sliding door leaves, and weight-bearing groove baffles are arranged at the front side and the back side of the hanging wheel weight-bearing grooves; one side of each hanging wheel weight-bearing groove is open, and the other side of the hanging wheel bearing groove is closed; and the hanging wheel mounting blocks are inserted into the hanging wheel bearing grooves from the openings of the hanging wheel bearing grooves. By arranging the sub-frame structure, the decoration efficiency can be improved, the probability of the sliding doors damaged or polluted can be reduced, therefore the integral sliding doors are more attractive; by arranging the hanging wheel weight-bearing grooves, the clearances between the door frames and the guiderails are reduced, therefore the aesthetic degree is improved; and the door frames are connected with one another through angle combining machines and screws, and accordingly the strength of the sliding doors is improved.