The invention discloses a tool and a method for weaving weft-direction arc-shaped fabrics for small prototypes, belonging to the technical field of textiles. On the prototype machine frame; input the pattern board diagram, after starting the working state, the warp yarn will automatically form a shed according to the pattern board data, and then manual weft insertion and beating can be performed; after the weft yarn is introduced into the shed, the beating wood knife is put into the shed. The reed is parallel to the reed. As the reed beats to the front of the machine, the wavy side of the wooden knife pushes the introduced weft to the loom; the reed is reset, and the pattern plate data is changed to the next weft through the induction system, thereby forming a new weft. the shed. Compared with the prior art, in the present invention, the warp and weft yarns are continuously interwoven, and the weft yarns are fixed in a wavy shape, and are arranged with different colors and wefts, so as to weave a characteristic fabric with wavy weft yarns, so that each piece of fabric has an inexhaustible texture. Reproducibility, clean fabric surface, clear texture, great style.