The invention relates to a reconstructible high-frequency chirped pulse signal generating device and method, and mainly aims at solving the problems that high-frequency chirped pulses generated in a present method cannot satisfy high frequency and high-precision range finding requirements for a modern radar. A femto second pulse signal generated by a femto second laser (1) is input to a fiber loop including a linear chirp fiber Bragg grating (7) and an adjustable delay line (6) via a three-port circulator a (2) for spectrum shaping, the optical pulse signal after spectrum shaping is input to a reconstructible chirp Bragg grating (9) via a three-end circulator b (3) for frequency-time mapping, an optical high-frequency chirped pulse signal, and a photoelectric detector (4) converts the optical high-frequency chirped pulse signal into an electrical high-frequency chirped pulse signal. Reconstructible frequency-time mapping is realized, the reconstructible high-frequency chirped pulse signal is realized, and the requirement of high bandwidth can be satisfied at the same time.