The work aims to study the surface integrity of the titanium alloy grid in abrasive flow machining. The titanium alloy samples were prepared by electric discharge machining. Based on single factor experiments, the effects of abrasive grain size, machining pressure and machining times on the surface roughness and surface morphology were discussed. Three kinds of samples with different initial surface roughness were selected to analyse the surface residual stress before and after abrasive flow machining. The single factor experiments were carried out to study the effect of machining times on the surface microhardness of samples. For titanium alloy samples, the larger the abrasive grain size and processing pressure, the more obvious surface polishing effect and the lower the surface roughness. When the abrasive grain size increases from 38 μm to 420 μm, the corresponding surface roughness value Ra decreases from 5.815 μm to 0.824 μm. And when the machining pressure increases from 8 MPa to 24 MPa, the corresponding surface roughness value Ra decreases from 4.314 μm to 1.398 μm. With the increase of machining times, the surface roughness shows a downward trend as a whole, and finally tends to be stable. When the machining times increases from 10 to 80, the corresponding surface roughness value Ra decreases from 5.925 μm to 0.307 μm, and finally stabilizes at about 0.300 μm. After abrasive flow machining, the surface residual stress of titanium alloy changed from tensile stress to compressive stress. With the increase of machining times, the surface microhardness of titanium alloy decreased at first and then increased, and the uniformity of surface microhardness increased significantly. When the machining times increases from 10 to 50, the microhardness value decreases from 532.83HV to 357.73HV. And when the machining times increases from 50 to 90, the microhardness value increases from 357.73HV to 393.48HV. It shows that increasing abrasive grain size, machining pressure and machining times can reduce surface roughness. The surface integrity of titanium alloy workpiece is greatly improved after abrasive flow machining.