Wire parameter measurement device includes current transformer, voltage transformer, AD conversion module, CPU, man -machine interaction module, communication module and environmental information gather expansion interface, current transformer and voltage transformer set up on the wire respectively, current transformer and voltage transformer are connected with a AD conversion module respectively, man -machine interaction module, communication module and two AD conversion module are connected with CPU respectively, environmental information gathers expansion interface and includes multiunit grafting end, a pin of being connected with CPU is drawn together to each grafting hand ladle, a power pin of connecting and a ground connection pin, the multiunit power pin of the end VCC that connects after parallelly connected that pegs graft, the parallelly connected back ground connection of ground connection pin that the multiunit was pegged graft and is held. The utility model discloses can connect different sensors as required, badly fall the back at the sensor moreover and change the convenience, it has reduced signal interference greatly, has improved the measuring accuracy.