The invention discloses a ship shafting segmented tail pipe device and an installation method thereof. The ship shafting segmented tail pipe device comprises a tail pipe, wherein the tail pipe is divided into a front tail pipe and a rear tail pipe; the front ends of the front and rear tail pipes are connected with front and middle bearing bases by first and second loose joints; the rear ends of the front and rear tail pipes are connected with middle and rear bearing bases by first and second epoxy gland flanges. The installation method comprises the following steps: firstly installing an oil pipe and a cable pipe inside the tail pipe; installing the rear ends of the front and rear tail pipes on the middle and rear bearing bases by the first and second epoxy gland flanges; supporting the front ends of the front and rear tail pipes by a jig frame; hoisting a tail shaft and head and tail sealing parts; after the tail shaft is hoisted in place, dismounting the jig frame and installing the first and second loose joints. According to the ship shafting segmented tail pipe device disclosed by the invention, the tail pipe is configured as a segmented tail pipe, and then all segments of the tail pipe are connected by utilizing the loose joints, the epoxy gland flanges and axial and end face sealing parts, so that the installation efficiency and the cleaning efficiency are greatly improved.