Impact force sensor for control rod

The invention discloses an impact force sensor for a control rod. The impact force sensor comprises a circular ring buffer stress plate, a buffer-type connecting seat and circular ring cutting-type elastic body which is formed by uniformly connecting eight arc beam-type pure cutting sheets along the circumference, wherein the circular ring buffer stress plate and the buffer-type connecting seat are respectively arranged on two ends of the circular ring cutting-type elastic body, a plurality of strain sheets with a lead are arranged on the side wall of the circular cutting-type elastic body, and the buffer-type connecting seat is provided with a rubber sealing core for covering the lead. The sensor structure is used for substituting a compression ring structural part between the control rod and a buffer structure, so that the global stress strain field of a buffer structural stress part compression ring can be precisely measured, the real value of the impact force of the buffer structural stress part compression ring when the control rod is finally dropped can be precisely measured, and the impact force sensor can work normally in the flowing water at the given pressure and is an impact force sensor with good water resistance.