The invention discloses a hectowatt-class continuous single-frequency all-solid-state laser achieved by a single resonant cavity. When a single annular resonant cavity achieves the hectowatt-class continuous single-frequency all-solid-state laser, the injection locking amplification technology is not required so as to achieve low cost. The phenomenon that the single resonant cavity into which a single crystal is inserted causes the stable area of the laser to be narrowed by a thermal effect during high-power pumping and the limit of a single crystal damage threshold on output power are solved.The output power of the laser can be greatly increased. When the single resonant cavity achieves a high-beam-quality high-power all-solid-state continuous single-frequency laser, the cavity of the laser is compact in structure, easy to integrate, and liable to commercialized production, and can be used for achieving an end-pumping and side-pumping all-solid-state continuous single-frequency laserwith high light-light conversion efficiency, high beam quality high power.