A telescopic mechanism includes a mounting base, a telescopic block received within the mounting base, and a pushing rod received within the mounting base. The telescopic block is vertically arranged in the mounting base, and the pushing rod is horizontally arranged in the mounting base. The telescopic block defines a guiding channel. The pushing rod passes through the guiding channel. The pushing rod is driven through the guiding channel to cause the telescopic block to extend or retract relative to the mounting base.