The present invention discloses a pulsed light generation device with adjustable microsecond-level pulse width at will. The device comprises a chopper, the chopper comprises a support, a drive motor and a chopping disc, the support is arranged on a mobile platform, the drive motor is arranged on the support, the drive motor drives the chopping disc to rotate around the vertical center shaft of thechopping disc, the incident light output by a light source can pass through a hollow section or can be shielded by a solid section, the incident light passing through the hollow section on the chopping disc is reflected by a first reflector and a second reflector to obtain reflection light, the reflection light can pass through the hollow section or can be shielded by the solid section. The present invention further discloses a pulsed light generation method with adjustable microsecond-level pulse width at will. The same chopping disc is employed twice to obtain the pulsed light with more narrow pulse width, the pulsed light generation device and method reduce the requirement for the duty ratio of the chopping disc, can regulate the pulse width through translation, are convenient to operate, simple in structure, small in volume, low in cost and high in practicability, are suitable for light with any wavelength from ultraviolet to infrared, and are high in damage threshold.