Alexandrite is an excellent broadband tunable laser crystal with many advantages, such as long fluorescence lifetime, high saturation energy density, wide absorption bandwidth, and excellent thermodynamic properties. The unique absorption band of alexandrite crystals shows that besides flash lamp, many visible light sources such as the blue laser diode (LD), green laser, yellow laser, and red LD can be used as pump sources. Among them, the alexandrite laser based on the mature high-power red LD pump source has the advantages of high efficiency and small volume, and has gradually become a hot topic in the field of solid-state laser. Using two fiber-coupled 638 nm high-power LDs as the pump source, a double-ended polarization pumping structure is used to pump the alexandrite crystal to achieve a visible light waveband laser output with a center wavelength of 760 nm and a power of 10.5 W. The optical-to-optical conversion efficiency is 20%. This is currently the highest output power realized by red-diode-pumped alexandrite crystals in domestic researches.