The invention relates to the technical field of power grid power installation tools, in particular to a pressing connection pipe drainage connection plate installation device which is used when power outage happens to electric transmission and transformation devices with the voltage of 220 kV and electric transmission and transformation devices with the voltage of 66 kV and disconnection and drainage are conducted. The pressing connection pipe drainage connection plate installation device carries drainage tools. The installation device comprises a connection plate clamp, an insulating rope, a hanging ring and a hook, wherein one end of the insulating rope is fixed to the connection plate clamp, the hook is connected to the appropriate position of the middle of the insulating rope and used for being hung on a wire, the hanging ring is connected to the insulating rope and used for connection between a human body and the insulating ring, the connection plate clamp comprises a back plate, a buckling pipe is fixed to the back plate, and a drainage connection plate is buckled through the buckling pipe. The purposes of arranging personnel, shortening the working time and the like are effectively achieved. The disconnection and drainage work of each phase can be completed by one person through installation, installation of the drainage of each phase can be completed by one person, time and labor are saved, the work of the personnel is reasonably divided, and the work efficiency is improved.