The present invention belongs to the high voltage distribution line intelligent technology field in an intelligent power grid, in particular discloses a high voltage distribution line automatic information knife switch. The high voltage distribution line automatic information knife switch is composed of a knife switch body part, a knife switch information part, a knife switch current part and a knife switch temperature part, and is characterized in that a temperature sensor acquires the temperature of a joint and sends to a knife switch temperature processor, and a current sensor acquires a knife switch tapping conducting wire current signal and sends to a knife switch current processor; the temperature or current information close to a threshold value is sent to a knife switch information main processor, and the transmitting-receiving communication processing is started to send to a power transmission and distribution management center background when the early warning or alarm is determined to need. The automatic information knife switch contains the address information in the current and temperature early warning or alarm information frames, so that a manager can know the fault position of a line very clearly by the addresses, and can overhaul and process conveniently and timely.