The invention provides a variable-amplitude movable deep sea sampling drilling machine. The variable-amplitude movable deep sea sampling drilling machine comprises a variable-amplitude device, a visual device, a hydraulic device, a control device and a walking vehicle, wherein the visual device is installed on the walking vehicle and comprises a light source, a camera and a lens; the variable-amplitude device is installed at the front end of the walking vehicle and comprises a drilling machine body, a pitching mechanism, a rotary disc and a power head b; the drilling machine body comprises a power head a, a sliding frame, a drilling frame, a drilling rod, a feeding oil cylinder, an oil cylinder fixing cavity and a drilling rod supporting base; and the pitching mechanism comprises a connecting rod a, a fixed hinged support, a movable arm oil cylinder, a drilling frame oil cylinder, a movable arm and a connecting rod b. Drilling sampling with the pitching angle ranging from 0 degree to 90 degrees and drilling sampling with the azimuth angle ranging from 0 degree to 180 degrees can be achieved, and the drilling range of the sampling drilling machine is enlarged; the visual device is introduced, and automatic obstacle avoidance and path planning of the sampling drilling machine on the seabed can be achieved; and the drilling frame can deflect left and right, the drilling angle is adjusted, and the variable-amplitude movable deep sea sampling drilling machine adapts to the severe environment with the uneven seabed bottom.