We report the high repetition frequency dual-wavelength pulse laser output of Pr3+:YLF at 604 and 639 nm. We discuss the relationship between the threshold powers of the dual-wavelength laser with the insertion of a Fabry-Perot etalon and numerically solve the corresponding four-level rate equations. Based on the results, we designed and conducted the experimental research. Then we obtained dual-wavelength pulse laser output at different repetition frequencies. When the repetition frequency is 40 kHz and the maximum absorbed pump power is 2.723 W, the output power at 604 and 639 nm are 27 and 25 mW, respectively. This study provides a simplest method for direct output of dual-wavelength visible pulsed laser.