A double-chamber inflatable paddle board with detachable function includes an outer chamber, an inner chamber and a fixing connector strip. The outer and inner chambers are independent chambers. A middle portion of the outer chamber includes an opening with an accommodating cavity that matches the inner chamber. One side of the fixing connector strip is fixedly connected to one of an inner edge of the outer chamber and an outer edge of the inner chamber, and the other side is suspended. In an inflated state, the other side of the fixing connector strip is engaged on one of the outer edge of the inner chamber and the inner edge of the outer chamber, to cooperate with the connected chamber to form an inflatable paddle board product with flat surface. The inner and outer chambers are detachably connected into one piece through the fixing connector strip.