A bridge technical condition degradation evaluation method in a maintenance state comprises the following steps of first, collecting bridge technical condition data to determine a technical condition of a bridge after running for K years, second, building a degradation condition model based on data collected in the first step, third, determining a bridge degradation model in a natural state to build a bridge maintenance and repair degradation model according to the model, fourth, introducing a parameter to build a post-bridge maintenance and repair condition degradation model to improve detection precision, and fourth, simulating a maintained bridge technical degradation condition according to the condition degradation model built in the fourth step to achieve a bridge technical condition attenuation rate, bridge initial degradation time and a technical condition curve. The bridge technical condition degradation evaluation method in the maintenance state can be well applied to bridge technical condition degradation rules due to comprehensive factors of nature, the human kind and the environment; strong adaptability and reliable results can be achieved; and high-precision evaluation and bridge technical condition prediction can be achieved.