The utility model relates to a system for evaluate electronic transformer ride quality among intelligent substation on line, including standard mutual inductor, a merging cells, the 2nd merging cells and data processing device, a merging cells's input is used for connecting electronic transformer, and data processing device is connected to the output, and standard mutual inductor connects data processing device through the 2nd merging cells. Utilizing two the same collection component - merging cells to carry out the merge application simultaneously to standard mutual inductor and electronic transformer's measured value, using the identity element to carry out data acquisition, can guarantee that data have the same collection precision, asynchronous nature and precision on the data acquisition that the data acquisition treatment element that prevents to use two differences brought differ, and then the too big consequence of error that causes when having avoided differing the data processing who brings owing to the precision, the utility model discloses can guarantee the accuracy of measured value.