The invention discloses a silicon-free oiling agent for carbon fiber precursor. The silicon-free oiling agent comprises an aqueous emulsion prepared by dispersing aromatic ester compounds, aromatic polyoxyethylene ether and amine compounds, by the mass ratio of (50-80):(10-35):(1-5), in water; the aromatic ester compounds include one or more of benzene tricarboxylic acid esters, benzene dioctyl phthalate esters, hydroxy-benzoate esters and bisphenol ethoxide high-grade fatty acid esters; aromatic polyoxyethylene ether includes one or more of alkylphenol polyoxyethylene and bisphenol-A polyoxyethylene ether; the amine compounds include one or more of lauramide ethoxide, aliphatic long-chain quaternary ammonium; the survival rate of mass of the aromatic ester compounds is 80-98% at the temperature of 300 DEG C in the atmosphere of air, and the mass ratio of the aromatic ester compounds in involatile components of the oiling agent is 50-80%. Roll banding degree of the precursor in production can be reduced effectively, doubling and adhering of PAN filaments in the pre-oxidation process can be avoided, and the silicon-free oiling agent has certain hydrophilicity and heat resistance.