The invention discloses a thermoplastic molding grid, a preparation method, application and an intermediate material. The thermoplastic molding grid is composed of longitudinal ribs and transverse ribs. The longitudinal ribs and the transverse ribs are perpendicularly connected to form multiple grid holes. Each grid rib comprises, by volume percent, 10%-80% of reinforced fibers and 20%-90% of thermoplastic resin. The preparation process of the thermoplastic molding grid comprises the steps that a one-dimensional linear intermediate material is prepared, a grid forming mold groove is filled with the intermediate material, the mold is heated so that the intermediate material can be molten, mold compounding, pressurizing, bubble discharging, cooling shaping, demolding and finishing are carried out, and finally finished products are obtained. The prepared novel thermoplastic molding grid has the advantages that production environment friendliness is achieved; materials can be recycled; thegrid is green and environment-friendly; the forming efficiency is high; automatic production can be achieved; the product quality is stable; the manual cost is low; the fiber content and the grid performance are high; designability of the fiber distribution manner is high; shapes are complex and diversified; and the resin selectable range is wide.