Children type needle fixing and protecting device

The utility model provides a child type needle head fixing and protecting device which comprises a hand ring, the hand ring comprises an upper ring body and a lower ring body, the two ends of the upper ring body and the two ends of the lower ring body are detachably connected, the lower ring body is connected with a fixed bottom plate, the upper ring body is hinged to a movable top plate, and the movable top plate and the fixed bottom plate are detachably connected through two connecting rods; a sliding block is slidably arranged on the movable top plate; a driving screw penetrates through the sliding block in a threaded mode, the two ends of the driving screw are arranged on the two opposite sides of the movable top plate respectively, a connecting block is rotationally connected to the end, facing the fixed bottom plate, of the driving screw, and the connecting block is further slidably connected with the sliding block through a guide rod; the cross section of the end, deviating from the connecting block, o