The invention discloses a plug pin type bathtub access hole mounting structure which comprises steel frames (1), plug pins (2), rotating shafts (3) and an access door (4). An access hole is formed in a skirt wall of the lateral side of a bathtub. One steel frame (1) is arranged on each of the upper side and the lower side of the access hole. The upper portion of the access door (4) is connected to the steel frame (1) on the upper side of the access hole through a plug pin type rotating shaft unit on the upper side, and the lower portion of the access door (4) is connected to the steel frame (1) on the lower side of the access hole through a plug pin type rotating shaft unit on the lower side. Each plug pin type rotating shaft unit comprises two plug pins (2) and one rotating shaft (3), one of the plug pins (2) is connected with the corresponding steel frame (1), the other plug pin (2) is connected with the access door (4), and the rotating shaft is inserted into the two plug pins (2) to be positioned and can rotate freely. The access door (4) covers and seals the access hole when being closed. The plug pin type bathtub access hole mounting structure is simple to construct and convenient to mount, service life of the access hole is prolonged, material waste is reduced, and standardized operation is facilitated.