Currently，the trend of source diversify of farmers' revenue has become more evident and the proportion of farmers' wage income has been increasing year by year. Although it is not the most important part of their income, it has become the most important source of increasing income. The level and speed of farmers' wage income growth directly affect the results of their income. The fluctuation in farmers' wage had a significant cyclical variation. Analyzing the law and reasons of the fluctuation in farmers' wage income will contribute to improve and provide objective references to the farmers' wage income.