The invention relates to a method for increasing yield of BTX aromatics, and mainly solves the problem that in the prior art, the utilization value of heavy aromatics and non-aromatics is low. According to the invention, heavy components containing polycyclic aromatic compound or carbons higher than or equal to six containing are mixed with hydrogen, the mixture enters a fixed bed reactor containing a catalyst, so that dealkylation and alkyl shifting reactions are performed on heavy aromatics, isomerization reaction is performed on light aromatics, and hydrocracking and aromatisation reactions are performed on heavy non-aromatics; the obtained BTX-rich reaction products continuously pass through a vapour liquid separator, a stripping column, a benzene column, a toluene column, and a dimethyl benzene column; the products of liquefied gas, benzene, toluene, and dimethyl benzene are obtained. The technical scheme excellently solves the problem, and can be applied to the industrial production of aromatics.