The utility model relates to the technical field of sickles, and discloses a cutter with a quick replacement structure, which comprises a cutter
handle, a
hydraulic cylinder is fixedly connected to the bottom of the inner wall of the cutter
handle, and a clamping mechanism is arranged at the top of the
hydraulic cylinder. The clamping mechanism comprises a vertical block, limiting blocks, a triangular block, a rolling wheel, a first rod, a second rod and a rotating rod, the bottom of the vertical block is fixedly connected with the top of the
hydraulic cylinder, the limiting blocks are fixedly connected to the inner wall of the back face of the cutter
handle, the number of the limiting blocks is two, the limiting blocks are slidably connected with the left end and the right end of the vertical block, and the triangular block is arranged on the limiting blocks. Through mutual cooperation of internal components of the clamping mechanism, the mechanical arms and the non-slip mats on the two sides are driven to clamp the main
cutting edge, replacement is facilitated when the main
cutting edge is abraded, the cutter groove and the standby
cutting edge are arranged at the cutter handle, replacement can be conducted immediately when the main cutting edge is abraded, and the situation that the harvesting progress is affected due to cutter
sharpening in working time is avoided.