The plastic gear injection mold requires extremely high precision in terms of dimensions and performance. The parameters include: addendum circle diameter, dedendum circle diameter, module, pitch circle diameter, pitch circle tooth thickness, pressure angle, helix angle, and tooth ring runout tolerance, among others. If the gear does not meet the precision requirements, it can lead to unstable transmission, accompanied by vibration or swaying motion, and excessively loud noise. Therefore, high machining accuracy is required for the concentricity of the plastic gear, the tooth profile, and other characteristics, with particularly stringent precision requirements for plastic gear molds.