The invention provides a text mining technology-based analysis method of economic benefit of a distribution network reliability. Through determining a study object, power cutting data information of the study object is acquired, power cutting data information keywords are extracted to establish a semantic mapping table with reliability investment, a pre-arranged power cutting prediction model and an analysis model of the economic benefit of the distribution network reliability investment are established, and the analysis model of the economic benefit of the distribution network reliability investment is adopted to calculate the economic benefit of the reliability investment when a power cutting plan occurs. According to the text mining technology-based analysis method of the economic benefit of the distribution network reliability, a data mining method of keyword extraction is adopted, and potential information mining for power network defect text can be realized; and the pre-arranged power cutting prediction model is constructed, thus the number of households at the time of power cutting and energy not supplied of the pre-arranged power cutting can be predicted according to an investment amount of each of future reliability improvement measures of a certain area, the model takes full account of influences of pre-arranged power cutting on the reliability benefit, and thus the return rate of the investment can be more accurately evaluated.