The invention brings forward a gluing mechanism for a gluing device of automatic flexible production line of receivers. The gluing mechanism comprises a gluing mechanism pedestal, a gluing mechanism side support frame, a gluing mechanism horizontal support frame, gluing components and a gluing channel. The gluing channel is fixed on the gluing mechanism pedestal. The top of the gluing channel is provided with two first channels. Two second channels are arranged on the gluing mechanism horizontal support frame. The two second channels are arranged corresponding to the first channels respectively. There are two sets of gluing components. The gluing component comprises a gluing pipe, a cylinder and a cylinder supporting seat. The cylinder supporting seat is fixed above the corresponding second channel. The cylinder is fixed on the cylinder supporting seat. A push rod of the cylinder passes through the second channel to be fixedly connected to the gluing pipe. The cylinder controls the gluing pipe to pass through the first channel and the second channel to enter the gluing channel. The gluing mechanism of the invention is used for gluing operation on a support. By the use of the gluingmechanism, automation degree is raised, production efficiency is improved, and production cost is reduced.