The invention discloses a non-mechanical-brake frequency converting control ship steering engine drive device and a control method. According to the drive device and the control method, a steering engine mechanism can be simplified, the size of the device is reduced and energy resources are saved. According to the technical scheme, the drive device is characterized by being composed of a frequency converter (1), a torque transducer (3), a steering engine mechanical device (4) and a frequency converting motor (5), the frequency converter (1) is connected with the frequency converting motor (5) and is further connected with the steering engine mechanical device (4) through the torque transducer (3), and the frequency converter (1) is provided with a torque given signal port (2), a Profibus-DP bus signal port (6) and a direct I/O signal port (7). The invention further discloses the control method of the non-mechanical-brake frequency converting control ship steering engine drive device.