The presented disclosure provides a gear processing apparatus, including a base, a driving unit, a bearing unit, a grinding assembly and a control unit. The driving unit, the bearing unit and the grinding assembly are arranged on the base. The bearing unit is used to carry the gear and can be activated by the driving unit to perform plural first corresponding axial movements relative to the bearing unit. The grinding assembly includes a grinding member. The grinding assembly can be activated by the driving unit to perform plural second corresponding axial movements relative to the bearing unit to contact the tooth surface of the gear by the grinding member. The control unit is used to control the driving module to apply additional movement to at least one of the plural first corresponding axial directions or/and at least one of the plural second corresponding axial directions during the grinding process to change the grinding directions of the tooth surface of the gear generated by the grinding member.