Objective To ensure the accuracy of the results in such products， the uncertainty of the aerobic plate count in the plant-derived foods was evaluated.Methods In accordance with the national standards for food safety GB 4789.2—2022， the aerobic plate count in plant-derived foods was determined by plate count agar medium and test sheets. The introduced uncertainty components in the experiments were evaluated until the synthetic uncertainties of the aerobic plate count in the plant-derived foods on plate count agar medium and test sheets were calculated respectively.Results As the confidence probability was 95%， the extended uncertainties of the aerobic plate count in the plant-derived foods on plate counte agar medium and test sheets were 0.045 863 and 0.049 436， respectively. And the confidence intervals of the measurement result were 7.0×10³-1.1×10⁴ and 7.0×10³-1.2×10⁴ CFU/g.Conclusion The uncertainties of the aerobic plate count in the plant-derived foods on plate count agar medium and test sheets have no significant difference between them. According to the evaluation data， the results of the test samples can be judged and analyzed. It is suggested to improve in-house detection ability to reduce the introduction of uncertainty. It will provide strong technical support to production， inspection and supervision of the plant-derived foods.