A feeding mechanism includes a supporting bracket; assembled to the supporting bracket; and a handling assembly. The handling assembly includes a pair of first handling subassemblies and a pair of first handling subassemblies. Each first handling subassembly includes a first guiding rod, a first elastic member, and a first handling member. The first guiding rod is slidably mounted on the supporting bracket, the first handling member is connected to the first guiding rod and the second guiding rod, the first elastic member is resisted between the first handling member and the supporting bracket. The second handling subassembly has a structure same as the first handling subassembly except that the guiding rod of the second handling subassembly has a length greater than that of the first guiding rod. The driving assembly is configured for driving the first handling member and the second handling member toward the supporting bracket.