In order to analyze the supervision mode of the platform economy from the perspective of blockchain, a blockchain-based method is proposed for the supervision mode of the platform economy. First, in terms of the speed of data collection, the economic monitoring and forecasting based on network big data are real-time from data acquisition to data analysis, so that problems can be detected earlier and serve the purpose of early warning of economic monitoring and forecasting; secondly, in the scope of data monitoring, data that has not been monitored in traditional fields becomes possible; thirdly, in data mining analysis, it can reflect more unpredictable knowledge laws. It proves that from the perspective of block chain, the platform pays the highest attention to the two indicators of taxation and establishment, accounting for 31.10% and 24.38%, respectively. The platform economic supervision model can also find certain correlations from the massive data and then analyze the laws of economic operation and find the influencing factors behind the phenomenon, so as to serve the supervision model.