The present invention is a transmission loss measuring device of an automobile silencer, which is useful for the manufacture of a silencer capable of accurately measuring the transmission loss of noise passing through the silencer in a simpler way, and thus reducing the noise more efficiently, wherein the silencer to be measured First and second cylindrical portions provided in a hollow cylinder; A sound source provided at an end opposite to an end of the first cylindrical portion provided with a silencer so as to generate noise in the first and second cylindrical portions; A first microphone installed in the first cylinder portion for measuring the magnitude of the noise before the noise generated from the sound source passes through the muffler; A second microphone installed in the second cylindrical portion for measuring the magnitude of noise after passing through the silencer; And means installed at the end of the second cylindrical portion to prevent noise passing through the first and second cylindrical portions from being reflected to the first and second cylindrical portions.
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