A system for testing call quality, comprising: a simulation base station; a tested communication device; a control device, configured to transmit a call instruction to the tested communication device such that a call between the tested communication device and the simulation base station is established; a testing device, configured to: provide a standard analog audio to the tested communication device after the call is established between the tested communication device and the simulation base station, wherein the standard analog audio becomes a test audio after it is processed by the tested communication device and the test audio is transmitted to the simulation base station during a transmission process via the call, and the test audio is sent back to the testing device by the simulation base station, and the test audio is not changed during the transmission process; and perform a similarity comparison between the test audio and the standard analog audio to obtain a similarity comparison result, wherein the similarity comparison result shows the call quality of the tested communication device, wherein the tested communication device is configured to originate the call to the simulation base station in response to the call instruction, and the simulation base station is configured to enter an automatic answering mode. a simulation base station; a tested communication device; a control device, configured to transmit a call instruction to the tested communication device such that a call between the tested communication device and the simulation base station is established; a testing device, configured to: provide a standard analog audio to the tested communication device after the call is established between the tested communication device and the simulation base station, wherein the standard analog audio becomes a test audio after it is processed by the tested communication device and the test audio is transmitted to the simulation base station during a transmission process via the call, and the test audio is sent back to the testing device by the simulation base station, and the test audio is not changed during the transmission process; and perform a similarity comparison between the test audio and the standard analog audio to obtain a similarity comparison result, wherein the similarity comparison result shows the call quality of the tested communication device, wherein the tested communication device is configured to originate the call to the simulation base station in response to the call instruction, and the simulation base station is configured to enter an automatic answering mode. provide a standard analog audio to the tested communication device after the call is established between the tested communication device and the simulation base station, wherein the standard analog audio becomes a test audio after it is processed by the tested communication device and the test audio is transmitted to the simulation base station during a transmission process via the call, and the test audio is sent back to the testing device by the simulation base station, and the test audio is not changed during the transmission process; and perform a similarity comparison between the test audio and the standard analog audio to obtain a similarity comparison result, wherein the similarity comparison result shows the call quality of the tested communication device, wherein the tested communication device is configured to originate the call to the simulation base station in response to the call instruction, and the simulation base station is configured to enter an automatic answering mode.