The invention discloses a data access method for multi-source data collection, which is characterized in that it includes the following steps: 1) defining the following data sets, including groups, stations, entities, channels and terminals; 2) extracting different stations and channels and information, according to the predetermined grouping standard, pre-group different stations and channels; 3) the original data directly collected by the communication terminal device; 4) the channel uses the transfer function to transfer the original data to the terminal; 5) the terminal The data exists in the entity, the plant, and the group, and the group will integrate the collected data into the integrated automation system of the power system. The present invention can connect multiple channels of different data sources, different communication terminals, and different communication protocols in different plants and stations to the comprehensive automation system of the power system, avoiding the situation of configuring different acquisition systems for different data acquisition channels, reducing The construction cost of the data acquisition system is reduced.