The invention discloses an installation device for deepwater stand pipes and underwater facilities, which comprises a main body tower frame. The top of the main body tower frame is provided with a top work platform. A plurality of guide pulleys are arranged on one side of the top work platform, a support work platform is arranged in the middle of the main body tower frame. A stand pipe fixing device is arranged at the front end of the support work platform. A stand pipe limiting device is arranged on a main support pin which is arranged on one side of the lower end of the main body tower frame. A limit device of a rendering winch cable is arranged on the other side of the lower end of the main body tower frame. A technical process for installing the stand pipes and the underwater facilities via an S-shaped pipe-laying ship is simplified, and the integration of pipe laying, installation of the stand pipes and the underwater producing systems via the S-shaped pipe-laying ship is realized. The installation device for the deepwater stand pipes and the underwater facilities is simply structured. The utilization maximum of the pipe-laying ship is realized and the pipe-laying ship can berepeatedly utilized on condition that the self-structure of the S-shaped pipe-laying ship is affected least.