The invention provides a firework plastic launching basin comprising a base, blocking pieces and a launching main body buckled on the base. The launching main body comprises a plurality of launching cylinders arranged longitudinally and transversely; a ribbed plate is arranged between the two adjacent launching cylinders on the same longitudinal row; and the blocking pieces are arranged on the launching cylinders or abut against the launching cylinders of the adjacent transverse columns correspondingly. Each ribbed plate is arranged between the corresponding two adjacent launching cylinders on the longitudinal row, the launching cylinders on the transverse columns are not connected by limited through the blocking pieces, so that the relative angles between the launching cylinders on the different longitudinal rows, and the relative positions of the opening parts of the launching cylinders on the different longitudinal rows can be changed, accordingly different patterns can be obtained after fireworks are ejected without the need of re-manufacturing of launching cylinder moulds, and thus the cost is relatively low; and meanwhile, bottom plates connected integrally are arranged at the lower ends of the launching cylinders, so that gunpowder is filled without splicing and is not liable to be ejected out in use, and the production efficiency is relatively high, and safety is achieved.