The invention relates to a frequency generator capable of achieving guide and communication of an automated guided vehicle (AGV), being capable of automatically guiding the AGV to perform electromagnetic guide, and also capable of achieving communication between an upper computer and the AGV. The functional structure of the frequency generator provided by the invention comprises a central processing unit (CPU), a field programmable gate array (FPGA) circuit, two pieces of direct digital frequency synthesizer DDS equipment and a feedback circuit. Output frequency can be stabilized to a constantcurrent via the feedback circuit, and the current is not changed along with the change of length of an external electric wire within a certain range. According to the frequency generator provided bythe invention, sinusoidal signals with different frequency are flexibly selected to output via a dial switch K1, and an electromagnetic sensor is used for recognizing a low frequency output signal toguide the AGV, and recognizing a high frequency output signal to achieve communication between the AGV and the upper computer. According to the frequency generator provided by the invention, the difficulty that a wireless communication technology cannot be used under a special working environment is effectively solved, and thus the AGV can be widely applied to more fields.