The present invention relates to the field of weeding equipment technology Specifically, it is a crop seedling protection type farmland precision weeding device Comprises a weeding and seedling protecting device, two sets of connecting frames are movably connected to the outer surface of the weeding and seedling protection device The weeding and seedling protection device is equipped with an adjustment component The adjustment component includes a piston tube A reciprocating screw rod is rotatably installed inside the piston tube The purpose of the present invention is : Two sets of telescopic rods drive two sets of cutterheads to expand through two sets of connecting frames Make the two sets of cutterheads plant according to different crop seedlings Expand the width of the trenches on both sides The two sets of cutterheads are close to the inside of the trench and will not touch the crop seedlings. They can accurately weed and turn the trench, preventing the traditional weeding and seedling protector from requiring manual removal of the buckles on the two sets of connecting frames for adjustment, resulting in adjustment. The process is cumbersome, time-consuming and energy-intensive, affects the weeding efficiency, and the adjustment accuracy is difficult to guarantee.