The invention discloses a low-addition-amount environment-friendly alkali-free chlorine liquid accelerator. The low-addition-amount environment-friendly alkali-free chlorine liquid accelerator is prepared from, by mass, 45-55% of aluminum sulphate, 5-10% of magnesium sulfate, 5-10% of alcohol amine, 1-5% of organic acid, 1-5% of high-molecular polymer, 0-3% of a stabilizing agent and the balance water. The aluminum sulphate is at the industrial level, and the mass fraction percent of alumina is larger than or equal to 16.00. The magnesium sulfate is at the industrial level, and the alcohol amine is diethanolamine or triethanolamine. The organic acid is oxalic acid, formic acid or benzoic acid. The high-molecular polymer is polyacrylic acid or polyacrylamide. The stabilizing agent contains citric acid. The organic acid is used as a coagulation accelerating component and a pH adjusting agent, and on the basis that no alkali exists, the accelerator is stable and free of strength loss within 28 days, and concrete resilience is small, the addition amount is remarkably reduced; polyacrylic acid is used, not only is later-stage strength not affected, but also the stability of a solution is improved, and the stable time of the accelerator is longer than half a year.