The utility model discloses a thin coal seam shearer and an auxiliary coaling device thereof. The auxiliary coaling device comprises an auxiliary coaling plate, a single-lug hinge joint seat, a snap spring, a round-link chain, a double-lug base and a pin shaft, wherein the auxiliary coaling plate is capable of freely rotating around the pin shaft and the snap spring is arranged on the pin shaft; the two ends of the round-link chain are connected to a rocker arm shell and the auxiliary coaling plate, respectively; the single-lug hinge joint seat and the double-lug base are fixed on the shell of the shearer rocker arm; the auxiliary coaling plate is provided with a double-lug hinged joint seat and a double-lug base, and the double-lug hinged joint seat is hinged to the single-lug hinged joint seat by use of the pin shaft. The thin coal seam shearer and the auxiliary coaling device thereof have the advantages that the coaling effect of a drum is remarkably improved, the labor intensity of a worker at a thin coal seam working face can be effectively reduced and certain mining efficiency can be improved. The thin coal seam shearer and the auxiliary coaling device thereof are simple to operate, convenient to use, and safe and reliable.