Nano Y-type titanyl phthalocyanine (Y-TiOPc) has received substantial attention in photoelectric conversion materials and devices, because it possesses strong light absorption in the range of 600~900 nm. However，the green preparation of Y-TiOPc with high stability is still a great challenge, because Y-type crystal is unstable and easy to be converted into stable β-type crystal, resulting in poor photoelectric response. Herein, we reported an efficient strategy to fabricate highly stable nano Y-TiOPc. In this work, TiOPc was dissolved in trifluoroacetic acid, and the obtained solution was dropped into ethanol solution at 0 ℃. Afterwards, adding to the 1, 2-C2H4Cl2/H2O microemulsion formed under strong shear at the shearing speed of 900 rmp，the precipitates was adjusted at 30 ℃ for 2 h to obtain highly stable nano Y-TiOPc. As a result, the average crystal size of Y-TiOPc is 2.86 nm and the crystallinity of Y-TiOPc is 93.82%. In addition, the crystal exhibits a stable crystalline type in the Methyl Ethyl Ketone/Cyclohexanone system after ultrasonic or ball milling dispersion for 4 h. And, the transmittance variation of the dispersion prepared with Y-TiOPc reaches 0.53% after 30 d. The response properties of organic photoconductivity device using Y-TiOPc as carriers generating material shows the V0 of -878.89 V, Rd of -12.10 V/s, Vr of -14.65 V, and E1/2 of 0.17 μJ/cm2 with excitation of 780 nm laser. This work provides an effective method for achieving Y-TiOPc nanomaterials with excellent performance.