The invention discloses a method and a system for analyzing a humidity field and a shrinkage stress field of concrete. The method comprises the following steps: acquiring relative humidity data, constructing a relative humidity equation based on the relative humidity data, solving the relative humidity equation to obtain relative humidity, and calculating the relative humidity to obtain shrinkage strain. acquiring elastic strain and creep strain, creating a stress time-history analysis formula based on the shrinkage strain, the elastic strain and the creep strain, calculating the stress time-history analysis formula to acquire analysis results of the concrete humidity field and the shrinkage stress field. The coupling relation between the relative humidity and the shrinkage strain is fully considered, and finally, the stress of the reinforced concrete structure under the shrinkage action is accurately analyzed on the premise of the creep action.