The invention relates to an efficient fluoride-free discharge aiding agent used for fracturing and a preparation method thereof. The discharge aiding agent comprises the following components in percentage by mass: 20-40wt% of a host agent, 15-30wt% of an enhancer, 20-40wt% of a solvent and balance of water, wherein the host agent is one or more mixtures composed of alkyl dimethyl betaine and dodecyl ethoxyl betaine; the enhancer is fatty alcohol-polyoxyethylene ether or dihydroxyethyl dodecyl amide. The preparation method comprises the following steps: firstly adding the solvent into an enamelreaction kettle, then adding the host agent and stirring for 1-2 hours at a rotating speed of 40r/min and the temperature of 40-50 DEG C, then adding the enhancer, stirring for 1-2 hours at a rotating speed of 40r/min and at the temperature of 40-50 DEG C, then adding water, continuously stirring for 0.5h at a rotating speed of 20r/min, and then uniformly mixing, thus obtaining the discharge aiding agent. The efficient fluoride-free discharge aiding agent provided by the invention has good compatibility, strong stability and strong temperature resistance and acid and alkali resistance, can beapplicable to discharge aiding during oil well fracturing and can be compounded and used with vegetable gelatin and multiple macromolecular polymer thickening agents. The efficient fluoride-free discharge aiding agent provided by the invention is especially applicable to discharge aiding during shale gas well fracturing.