The invention provides a passive servo large-damping earthquake rotation accelerometer, and belongs to the field of earthquake measurement devices. The passive servo large-damping earthquake rotation accelerometer comprises a bottom plate, a spoke-type mass spring device, two swing-type passive servo large-damping moving coil transducers and a circuit board. Each swing-type passive servo large-damping moving coil transducer comprises a swing frame, a moving coil assembly and a magnetic circuit system. One ends of the two swing frames are symmetrically installed on the two sides of a mass ring of the spoke-type mass spring device, and the moving coil assemblies are installed at the other ends of the swing frames and stretch into magnetic gaps of the magnetic circuit systems. The circuit board comprises two passive servo large-damping moving coil transduction circuits, two angular acceleration conditioning circuits and a combination circuit. The transducers are connected with the input ends of the transduction circuits, the output ends of the transduction circuits are electrically connected with the input ends of the angular acceleration conditioning circuits, and the output ends of the two angular acceleration conditioning circuits are connected with the combination circuit. The combination circuit is used for eliminating non-rotation components, combining rotation components and outputting voltage signals in direct proportion to the earthquake rotation acceleration.