The invention discloses a method for decomposing scheelite through cyclic hydrochloric acid of mother liquor. The method comprises the following steps of conducting pretreatment, specifically, mixingand stirring the scheelite with the grain size not greater than 150 microns and a hydrochloric acid at normal temperature to obtain pretreated concrete containing WO3 greater than or equal to 60% andP less than or equal to 0.03%; collecting pretreatment acid mother liquor; converting and purifying the pretreatment mother liquor, specifically, neutralizing the obtained pretreatment acid mother liquor through CaCO3 or CaO or Ca(OH)2, conducting filtering, extracting tungsten or molybdenum in the solution and converting and purifying the pretreatment acid mother liquor; conducting acid decomposition, specifically, mixing and filtering the obtained pretreated concrete and the hydrochloric acid to obtain a solid tungstic acid filter cake and acid decomposition mother liquor; converting and purifying the acid decomposition mother liquor, specifically, extracting tungsten and molybdenum from the obtained acid decomposition mother liquor through a neutral extraction agent under the acidic condition and converting and purifying the acid decomposition mother liquor. Through the method, different grades of scheelite can be treated, the adaptability to raw materials is high, waste acid motherliquor can be reutilized, and the problem existing in treatment on the waste acid mother liquor is solved.