The invention discloses laboratory organic waste liquid treatment method and system, and belongs to the technical field of environmental protection equipment. The treatment method comprises the following steps: (1) collecting and temporarily storing the organic waste liquid in a laboratory; (2) adjusting the pH value; (3) precipitating the liquid; (4) flocculating and settling the liquid; 5) performing reverse osmosis; 6) performing oxidization; and 7) performing after-treatment; wherein the treatment system comprises a collection tank, a classified temporary storage tank, a neutralization tank, a sedimentation tank, a flocculation tank, a sedimentation tank, a reverse osmosis tank and a superoxide tank, which are connected in sequence. According to the method and the system, the organic waste liquid in the laboratory is fully treated step by step through acid-base neutralization, precipitation, flocculation, sedimentation, reverse osmosis and supercritical oxidation, so that the treatment efficiency is high, the harm to the environment is reduced, waste is turned into wealth, and resource recycling of the organic waste liquid is realized; meanwhile, the system is reasonable in design and can be freely adjusted and assembled according to requirements.