The invention provides a formula of a cigarette cartridge. According to the formula, the cigarette cartridge is prepared from tobacco leaf extract, tobacco essence, a tobacco flavor, a tobacco juice solvent and deionized water, specifically, the cigarette cartridge is prepared from the following ingredients in percentage by mass: 6%-15% of the tobacco leaf extract, 8%-22% of the tobacco essence, 4%-10% of the tobacco flavor, 30%-45% of the tobacco juice solvent, and 12%-22% of the deionized water, wherein the tobacco juice solvent is prepared from the following ingredients: propylene glycol, glycerol, 1,3-butanediol, sorbitol solution and xylitol solution, specifically, the tobacco juice solvent is prepared from the following ingredients in percentage by mass: 20%-60% of propylene glycol,30%-50% of glycerol, 10%-30% of 1,3-butanediol, 1%-10% of sorbitol solution, and 1%-10% of xylitol solution. For the formula of the cigarette cartridge, improvement is carried out on the formula of the traditional cigarette cartridge, through the use of the tobacco essence and the tobacco flavor, the irritation generated when tobacco juice is smoked later is reduced, the tobacco juice solvent in the cigarette cartridge is improved, then the smoke concentration and mouth filling sense of the electronic cigarette are effectively improved, and thus the smoking of most smokers can be well satisfied.