Machine head used for clearing sludge on the bottom of river bed

The invention discloses a machine head used for clearing sludge on the bottom of a river bed. The machine head comprises a machine head body, a control mechanism capable of vibrating, scratching and feeding the sludge on the bottom layer is arranged in the machine head body, the control mechanism comprises four vibrating cavities which are symmetrical around the center of the machine head body, and openings of the four vibrating cavities face outwards. Vibrating rods capable of sliding up and down are arranged on the inner walls of the vibrating cavities, the upper sides of the vibrating cavities are communicated with a movable annular cavity, a movable ring capable of sliding up and down is arranged on the inner wall of the movable annular cavity, four connecting columns which are symmetrical around the center of the movable ring are arranged on the bottom face of the movable ring, and the connecting columns extend downwards and partly stretch into the vibrating cavities. In the machine head, the up-down vib