The invention relates to verification and testing of a cargo hold smoke detection and particularly relates to a function verification and testing method of a cargo hold smoke detection system. The function verification and testing method comprises the following steps: setting a pre-set ventilation rate in a testing cargo hold; arranging rectangular collection plates with the pre-set quantity in the testing cargo hold and arranging a smoke point at a pre-set position of each rectangular collection plate; under empty-load, half-load and full-load conditions, carrying out a smoke detection function test on all the smoke points of all the rectangular collection plates by utilizing a smoke generator respectively, and determining alarm response time of each smoke point under a corresponding condition; and taking the smoke point with the longest alarm response time as a severe point. According to the function verification and testing method of the cargo hold smoke detection system, provided by the invention, the smoke point with the longest alarm response time under the three states is taken as the severe point, so that a suitable placement method of the smoke generator and a stacking form of cargoes are obtained, and a testing result of a smoke detection function is more accurate.