The invention relates to an intelligent power grid sensing device which comprises a casing and an electronic circuit board. The casing comprises a first cavity, a second cavity and a third cavity. The device further comprises an opening closing and locking part. The opening closing and locking part comprises an opening closing screw, a compression spring, a tension spring and a power line locking slide block. The opening closing screw successively runs through the first cavity, the power line locking slide block, the second cavity and the third cavity from top to bottom. The power line locking slide block and the first cavity are connected through the compression spring and the tension spring. The intelligent power grid sensing device has the advantages of low cost and weight and high reliability.