A foam soap-providing machine with function of recycling soap-liquid, which comprises: a container containing a soap-liquid and having a soap-releasing portion; a shell-group including at least two detachable shell-bodies combinedly disposed on the outer peripheral surface of the soap-releasing portion; and a faucet mounted on the upper end of the soap-releasing portion and having a soap-feeding portion provided for flowing out the pressurized soap-liquid; wherein the soap-feeding portion has a joint end; wherein a foam-generating module used to generate a foam and a foam-recycling module used to recycle the extruded unused foam are comprised in the shell-group; thereby it can generate foam and recycle the remaining foam in the soap-releasing portion through a single motor. Accordingly, the present invention greatly saves the structural volume and prevents the soap-liquid from being dropped outside and wasted.