Manufacturing method of a composite long fiber product

A manufacturing method of a composite long fiber product having steps of:

• preparing base materials:
• preparing a first plastic base material, a second plastic base material, and a carbon fiber base material;
• mixing the base materials:
• transporting the second plastic base material and the carbon fiber base material into a first mixing device, grinding the carbon fiber base material, wherein an average length of the grinded carbon fiber base material is at least 10 millimeters, and then mixing the grinded carbon fiber base material and the second plastic base material in the first mixing device;
• and
• injection molding:
• transporting the first plastic base material into a first gate of a molding device, transporting a mixture of the carbon fiber base material and the second plastic base material into a second gate of the molding device, wherein a position of the second gate is higher than a position of the first gate, and then injecting the first plastic base material from the first gate and the mixture of the carbon fiber base material and the second plastic base material from the second gate into the molding device.