An embodiment of the invention provides a white laser generating device comprising an infrared laser source, a first optical fiber, a frequency doubling crystal, a second optical fiber and a spectrum widening module which are arranged sequentially. The infrared laser source is used for generating infrared laser, the frequency doubling crystal is used for utilizing frequency doubling effect to convert the infrared laser into visible laser, and the spectrum widening module is used for widening the visible laser to obtain white laser. The infrared laser source passes through the frequency doubling crystal for laser frequency doubling, efficient ultrashort pulse frequency doubling is realized, the visible laser of certain wavelength is output and then enters a nonlinear medium through coupling by the second optical fiber, and high-power broadband visible laser outputting is realized. At the moment, spectra can cover wavebands of 450-760 nm, and high-power white laser can be generated.