The invention provides a compound coal rock crushing cantilever work mechanism with a function of hydraulic cylinder location limit, belonging to the field of excavation equipment. The compound coal rock crushing cantilever work mechanism with the function of hydraulic cylinder location limit is ingenious in structure, is provided with a spring system and a hydraulic cylinder location limiting mechanism, and is simple and reliable in structure and convenient to maintain; a hydraulic cylinder can balance the spring force of a spring system. When making reciprocating motion, a vibration box drives a spline shaft to make reciprocating motion, thus pushing a piston of the hydraulic cylinder to make reciprocating motion along the axial direction; the hydraulic cylinder is internally and fully filled with hydraulic oil, and two hydraulic chambers are communicated with each other; left and right impact vibration cutting is realized, and the amplitude of the impact vibration cutting is limitedat the same time. The cantilever work mechanism provided by the invention can be used for cutting hard rocks, is applicable to the fields such as coal mine roadway excavation and rock tunnel excavation, and has the characteristics of being high in excavation efficiency, convenient to maintain and the like.