The invention relates to reconstituted tobacco containing composite tobacco aroma substances prepared by a water extraction method and a supercritical CO2 extraction method. 40kg of waste and second-rate tobacco powders are added with 200L of water and are stirred and extracted for 1h at 50 DEG C. After filtration the extraction liquid is extracted and concentrated to the density of 1.2g/mL. The water concentration liquid is reserved. 3kg of waste and second-rate tobacco powders are extracted by supercritical CO2. The extraction condition comprises that the pressure of an extraction kettle is 25MPa, the extraction temperature is 40 DEG C, the CO2 flow rate is 200L/h, the extraction time is 4h; the pressure of a separation kettle is 5MPa, and the separation temperature is 45DEG C. 115g of extractant is obtained after the extraction. 10000g of water concentration liquid and 30g of supercritical CO2 extraction liquid are mixed uniformly and added to reconstituted tobacco base sheets. According to the reconstituted tobacco, the quality is improved, the aroma amount is increased, the fragrance is promoted, and the natural cigarette flavor is set off; the dry sensation of cigarette smoke is lowered, but the saliva secretion sensation of the cigarette smoke is enhanced; therefore, the comfort of a cigarette is improved.