The invention belongs to the field of astronomic photonics, and specifically relates to an embedded fiber lantern based on a plastic photonic crystal fiber perform rod. The cladding layers of a plurality of plastic fibers are removed, and then the plastic fibers are inserted into a plurality of holes close to the center of the plastic photonic crystal fiber perform rod with periodic air holes, wherein the arrangement mode of the plastic flickering fibers is not fixed, so the fibers can be embedded into different air holes according to the actual demands, so as to form fiber core structures indifferent shapes, thereby facilitating the transmission of a light beam. Afterwards, the tapering of the perform rod is carried out, so as to enable the fiber lantern to be made into an optical fiberconnector with one end being provided with the plurality of fibers and the other end being a fiber convergence terminal. The plurality of holes with the plastic fibers form a fiber core of the fiber convergence terminal. The surrounding holes without the plastic fibers become an air cladding layer, thereby finally achieving the transmission of light. The lantern is simple in manufacturing, is flexible in structure, reduces the loss of an optical signal, and can be used in a water Cerenkov detector.