The uniform tensile process of TC4 titanium alloy samples with circular V-notch was monitored by the acoustic emission non-destructive testing technology, and the influences of different deformation stages on the acoustic emission characteristic parameters of TC4 titanium alloy sample with different V-notches during the tensile process were explored. The results show that the distribution of acoustic emission signals corresponds to each stage of the tensile process. During the entire tensile fracture process, the amplitude signals of samples with different V-notches are mainly distributed between 40-70 dB, only a small amount of high-amplitude signals appear during the entire plastic deformation process, and the high amplitude signals of 100 dB appear at the moment of fracture for all samples. The accumulated count and accumulated energy of acoustic emission increase with the accumulation of damage. In addition, TC4 titanium alloy samples with different V-notches exhibit obvious stage characteristics in the accumulated energy and accumulated count curves of acoustic emission from elastic deformation stage to fracture stage, the slopes of the curves are similar, and the values of accumulated count and accumulated energy are similar.