The utility model discloses a multi-degree-of-freedom compensation swing angle sensor for a coal cutter. The multi-degree-of-freedom compensation swing angle sensor comprises slide rail connecting base components, link sliding block components, rotary components and sensor components, wherein the slide rail connecting components comprise a slide rail seat, a pin shaft, a cover plate and a fastening piece; the link sliding block components comprise a link, a sliding block and a self-made screw; a sliding block groove in which the sliding block is arranged is formed in the slide rail seat, and the sliding block can slide in the sliding block groove; one end of the link is connected with the rotary components, and the other end of the link is connected with the sliding block in the slide rail seat; the rotary components mainly comprise a rotating shaft, a rocker arm and a fastening piece; the link is inserted into the rocker arm and fixed by the fastening piece; the rocker arm is inserted into the rotating shaft and drives the rotating shaft to rotate; the sensor components are connected with the rotating shaft which drives the sensor components to achieve real-time angle measurement. The multi-degree-of-freedom compensation swing angle sensor for the coal cutter can dynamically monitor the rotating angle of the rocker along with swinging of the rocker.