The invention provides a drive-by-wire drop type deep water platform soft cabin loading system which comprises at least one soft cabin, at least one rope tensioning support and at least one handle rotating block, wherein a through hole is formed in the bottom of each soft cabin; at least two support columns with equal height and one support rod body are arranged on the end face of each rope tensioning support, and an axial through hole is formed in the support rod body and extends to the rope tensioning support as well as is communicated with the outside; the height of the support rod body is less than that of the support column; a rope is arranged in the axial through hole, and a free end, arranged on the end of the support rod body, of the rope is connected with a hole plug which can be matched with the through hole; and another free end, arranged on the rope tensioning support, of the rope is connected with the handle rotating block. According to the invention, remote-distance operation can be realized, the influence of vibration caused by manual operation on mode testing precision is relieved, and thus the reliability of a mode test is improved; and the ballast capacity of ballast water quantity can be accurately controlled, and opening and closing actions under any state are realized.