The present invention provides a tightness test apparatus and method of an aluminum alloy belt interlocked and armored cable. The apparatus comprises a first supporting device, a threading device, a loading device and a driving device; the threading device is connected with the first supporting device in a manner that the threading device can move up and down; the loading device is arranged below the threading device; the threading device is provided with a channel; an aluminum alloy belt interlocked and armored cable to be tested includes an armored layer section and a conductive wire core section; the armored layer section is arranged in the channel in a clamped manner; the conductive wire core section at the lower end of the aluminum alloy belt interlocked and armored cable to be tested extends out from the channel and is connected with the loading device; the driving end of the driving device is connected with the threading device; the driving device is used for driving the threading device to move up and down; and the loading device is used for applying a loading force onto the conductive wire core section. With the tightness test apparatus and method of the aluminum alloy belt interlocked and armored cable of the invention adopted, the tightness of the aluminum alloy belt interlocked and armored cable to be tested can be well tested, test accuracy can be improved, and the performance of the aluminum alloy belt interlocked and armored cable to be tested can be better evaluated.