Titanium alloy parts prepared by additive manufacturing （AM） technology have a wide range of applications in the aerospace field. For the precision parts of AM titanium alloy， post-processing such as milling and polishing are essential processes. The polycrystalline diamond （PCD） micro end mill is used to carry out micro-milling experiments on forged titanium alloy and titanium alloys prepared by selective laser melting （SLM） technology without heat treatment and after heat treatment. The micro-milling properties of titanium alloy materials prepared by three different manufacturing processes are studied. The results show that the milling force of SLM-heat-treated titanium alloy is the highest， which is related to the highest hardness of the material. In micro-milling， the size of top-burrs on the up-milling side is larger than that on the down-milling side for all materials. Among the titanium alloy materials， SLM-titanium alloy generated the smallest top-burr width， which is related to its poor plasticity. The surface quality of SLM-heat-treated titanium alloy is the best， which is not only related to the hardness and plasticity of the material， but also affected by the porosity of the material.