A broadband, frequency-reconfigurable polarization rotator utilizing an active metasurface is proposed. The unit cell consists of orthogonal metal layers embedded with PIN diodes, separated by a dielectric layer, enabling broadband polarization conversion and frequency reconfiguration capabilities. Simulated results indicate that within the two frequency bands of 7.67-10.51 GHz and 10.36-12.45 GHz, x-polarized incident waves can be converted into y-polarized transmitted waves with a polarization conversion ratio exceeding 90%. Compared with other designs, by changing the state of PIN diodes, the transmitted wave can be freely switched between two operational frequency bands, while exhibits 45°angular stability. Moreover, a slot-type configuration is devised to avoid the design of additional feeding lines. The proposed polarization converter holds significant potential for applications in wireless communication, radar detection, and transmitarrays.