Frame strander with automatic reel feeding function

The invention relates to a frame stranding machine with an automatic tray feeding function, which comprises a machine base, a stranding cage and a traction mechanism for driving the stranding cage, the stranding cage is provided with a plurality of mounting grooves arranged along the circumferential direction of the stranding cage, a plurality of groups of mandrels for mounting trays are arranged in the mounting grooves along the axial direction of the stranding cage, the mandrels are telescopic, and the mandrels are connected with the traction mechanism. A sliding rail capable of getting close to or getting away from the mandrel in the radial direction of the stranding cage and a locking mechanism for locking the sliding rail to the bottom of the mounting groove are arranged in the mounting groove, the sliding rail is distributed in the axial direction of the stranding cage, and a frame is arranged on the outer side of the stranding cage. A supporting rail mechanism capable of unlocking the sliding rail and