Three dimensional (3D) flower ball Ti3C2/TiO2 composite photocatalyst was derived from two-dimensional (2D) layered Ti3C2. The materials were characterized by XRD, SEM, TEM, UV-Vis DRS and PL analytical methods, and the photocatalytic activity of Ti3C2/TiO2 synthesized at different temperatures was compared. The results showed that Ti3C2/TiO2 synthesized at 500 ℃ showed better photocatalytic degradation efficiency for acid fuchsin (AF). After 90 min of light reaction, the degradation rate reached 97.57%. With its high conductivity and Schottky barrier formed at the interface with TiO2, Ti3C2 effectively improves the charge separation rate, inhibits the electron hole recombination, and improves the photocatalytic activity of the material. In addition, the photocatalyst has good stability. After repeated cycles of use for 5 times, the AF degradation rate can still reach 86.39%. Active species capture experiments show that holes (h+) and superoxide radicals (·O2-) are the main active substances that degrade AF. This study reveals the enhancement mechanism of Ti3C2 to the improvement of photocatalytic performance, and provides a relevant reference for the application of MXene materials in the field of photocatalysis.