The invention discloses a vacuum squeezed state light field generation device and method. The device comprises a laser, an optical parametric oscillator, a frequency shifting device, a temperature control device, a lock cavity device, a half wave plate, a first polarized light beam splitter, a second polarized light beam splitter and a dichroic mirror. Due to the frequency shifting device, rapid frequency shifting of continuous single-frequency laser can be achieved, fill-in light is obtained, and the broadcasting direction of the laser cannot be changed; fill-in light passes through the optical parametric oscillator to obtain fill-in light with cavity information, the lock cavity device can generate a lock cavity signal according to the fill-in light with the cavity information and perform cavity length locking on the optical parametric oscillator, the temperature control device can achieve precise temperature control over crystals, and the optical parametric oscillator works in the degenerate state. By adopting the device or method, the problem that seed light is injected or a triply resonant optical parametric oscillator must be adopted can be avoided, the mechanical stability of the optical parametric oscillator is maintained, and therefore the stably-output vacuum squeezed state light field is obtained.