The invention provides a high-temperature resistant sound-absorbing fiber membrane and a preparation method. The fiber membrane is a polyimide piezoelectric composite nanofiber membrane with a hollowstructure; the preparation method particularly comprises the following steps that 1, a polyamide acid (PAA) solution of composite piezoelectric ceramic powder is prepared; 2, the PAA composite solution is a shell spinning solution, a polystyrene (PS) solution is a nuclear layer spinning solution, a coaxial electrospinning technology is adopted, and a PAA/PS nano composite fiber with a nuclear shell structure is obtained; 3, high-temperature imidization treatment is conducted, internal PS is removed through thermal decomposition, and a piezoelectric fiber membrane with a hollow structure is obtained; 4, polarization treatment is conducted, the polyimide nano fiber prepared through the method is uniform in size, the hollow structure is complete, the fiber membrane has the high porosity, thematerial has the light porous hollow structure facilitating sound wave dissipation and the piezoelectric effect generated by piezoelectric particles, the excellent sound absorption property is shown,the good high temperature resistant property and mechanical property are achieved, the sound absorption and noise reduction requirements in the high temperature environment can be met, and the high-temperature resistant sound-absorbing fiber membrane is applicable to the fields of aviation, spaceflight, military equipment and the like.