A method for monitoring quality of data transmission in an IDC network includes: monitoring data sent by an application service node and data received by a data storage node of the application service node in an IDC network; acquiring index items of sent data and index items of received data; calculating, according to the index items of sent data and the index items of received data, a data transmission quality index of the sent data and the received data; and raising an alarm according to the data transmission quality index. By contrast, transmission of erroneous data that causes a waste of network bandwidth resources can be avoided, and data calculation performed according to the erroneous data resulting in an erroneous data calculation result is further prevented; therefore, occupation of unnecessary calculation resources and a bad decision that is generated according to the erroneous data calculation result can be prevented.