The invention discloses a ship broadside exhaust pipe elastic suspension connecting device which comprises a first support connected with a ship body, and a second support connected with an elastic suspension assembly. The first support and the second support are connected through at least one group of adjustable connecting assembly; each adjustable connecting assembly comprises a first connectingpiece connected with the first support, and a second connecting piece connected with the second support; the first connecting pieces and the second connecting pieces are in threaded connection through sleeve pipes; and through holes are formed in the first support and the second support, so that the first support and the second support can be conveniently centered and adjusted. According to the ship broadside exhaust pipe elastic suspension connecting device provided by the invention, a preassembling manner of a pre-manufacturing mold plate is replaced, and no manual spacer grinding or physical drilling construction operation is needed, so that the cost is reduced, the labor intensity is relieved, the efficiency is improved, and the quality risk is effectively reduced.