Although the traditional Fredkin gate can achieve the corresponding logic function, its extinction ratio and crosstalk need further improvement. In view of this, a silicon-based all-optical Fredkin gate based on the cross-phase modulation effect is proposed and designed. The all-optical reversible logic gate consists of two 2×2 directional couplers, a 2×1 directional coupler, and a 1×2 directional coupler and two-phase shift arms. By using the cross-phase modulation effect caused by the pump light and the signal light in the phase shifter arm, the phase difference of the signal light in the upper and lower phase shift arms can be changed, outputting light waves of different amplitudes at different ports of the designed device. Then, it realizes the logic function of the Fredkin gate. Besides, MATLAB and integrating the split-step Fourier method are used to simulate and analyze the designed silicon-based all-optical Fredkin gate. The simulation results show that the worst extinction ratio of the device can reach 48.46 dB.