The invention, which belongs to the technical field of reliability test, provides a temperature step-by-step enhancement test method and system for a smart electric energy meter. The method comprisesthe steps that: a temperature range for performing reinforcement testing on a to-be-tested smart electric energy meter is determined. To be specific, step 1.1, pretesting before testing is carried outon a to-be-tested smart electric energy meter in a test box and an initial value of each of a plurality of parameters is determined; step 1.2, the to-be-tested smart electric energy meter is determined to be heated completely within predetermined time, enhancement testing is carried out on the to-be-tested smart electric energy meter for 1.5 hours according to a test item, and a current value ofeach parameter is obtained; and step 1.3, whether a difference value between the current value and the initial value of any parameter satisfies a cutoff criterion is determined; and when the cutoff criterion is not satisfied and the temperature T is less than 60 DEG C, the T is equal to a sum of the T and 10 and the step 1.1 is carried out; or when the cutoff criterion is not satisfied and the temperature T is larger than or equal to 60 DEG C, the T is equal to a sum of the T and 5 and the step 1.1 is carried out. Therefore, testing item results of the smart electric energy meter under different step length combinations are obtained; and thus the limit working levels of the temperature and humidity of the smart electric energy meter are determined accurately.