The invention discloses an optical module test system and a method thereof. The test system comprises an oscilloscope, a power meter, a spectrometer, an optical attenuator, a light source module and abit error detector. The key test indexes of the optical module, such as optical power, an extinction ratio, a spectrum, a channel cost, an overload, a sensitivity, a receiving/emitting terminal monitoring and the like, are integrated into a test link to realize the test. Compared with the prior art, the invention has the following positive effects: 1, under the condition of guaranteeing the module production and testing, the invention realizes: 1, integrates the testing process of the optical module, reduces the software management work, avoids the risk of the software management, reduces thetesting cost and ensures the testing demand; 2, clever link design enhances the efficiency of the instrument; 3, the relativity between the test indexes is established, which is equivalent to the strict test requirements and enhances the reliability of the test results.