Reconfigurable Intelligent Surfaces (RIS) feature easy scalability, high integration, and high flexibility, holding significant application prospects in terahertz communication and detection fields. Resonant electronically controlled terahertz RIS based on switching of surface current distribution modes suffer from issues such as limited amplitude consistency among units, narrow phase shift bandwidth, and difficulty in simultaneous amplitude and phase modulation due to structural asymmetry. To address these problems, this paper proposes a terahertz reconfigurable intelligent reflective surface based on geometric phase and simultaneous amplitude-phase modulation. The metasurface unit forms a one-dimensional array through the coplanar integration of a single-symmetric resonant structure and dual feedlines. By controlling the reversal of surface current via alternate on-off switching of diodes on the left and right sides, it achieves a maximum cross-polarization reflection amplitude of –4.20 dB at 0.14 THz, and a 1-bit encoded geometric phase shift of 180° ± 10° in the 0.12–0.16 THz band. Through regulating the surface current with a high-speed modulated bias voltage, a maximum amplitude modulation of 12.15 dB is achieved at 0.14 THz, and the phase shift remains 180° ± 10° in the 0.14 THz ± 15 GHz range. This realizes simultaneous amplitude-phase modulation of the electronically controlled Pancharatnam-Berry(PB) phase microstructure and one-dimensional beam scanning of ± 70°. This Meta device, characterized by a simple structure, broadband simultaneous amplitude-phase modulation, and large-range beam scanning, provides a new technical approach for terahertz RIS systems integrating beamforming and information modulation.