The present invention relates to a call path test apparatus and a test method of a key phone, which is a dedicated terminal of a key phone system, and more particularly, to a call path test apparatus and a test method of a key phone to test each call path with one measuring instrument. A key-phone call path test apparatus having a main module (MM), a main device including a digital subscriber module (DSM) and a power supply module, and a key phone connected to the digital subscriber module of the main device as a test target, wherein the main device includes: A reference device connected to the digital subscriber module as a reference for the test; A switch to which the reference device is connected to the handset transmission / reception path, the keyphone and the handset transmission / reception path, a hands-free reception path and a hands-free transmission path are switched in various stages; A communication test apparatus is provided in which a receiving port RX is connected to a transmitting port TX of the switch, and a transmitting port TX is connected to a receiving port RX of the switch. By testing the furnace, there is an effect of improving the mass production and the reliability of the test due to the shortening of the test time.
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