The utility model provides a novel overhead line residual current detection device, including flexible luo shi coil, luoshi integrator and support member, support the member and include U type pole and pole setting, U type pole with the top fixed connection of pole setting, flexible luo shi coil does not link to each other along the head end and the end of pole setting of U type and flexible luoshi coil, and the output and the input of luoshi integrator of flexible luoshi coil are connected. The utility model discloses a flexible luo shi coil, luoshi integrator and support member, simple structure, convenient to use, the residual current of safe and reliable's measuring play circuit fast.