The present invention provides a method for generation fault signals through a bus signal fault simulation device based on a CAN, and relates to a method for generation of fault signals through a fault simulation device. The objective of the invention is to solve the problems that it cannot be determined whether each node of a bus executes correct the mechanism of error processing or not when the bus has faults and a current CAN test device is high in cost and not high in universality. The method comprises: an arbitrary-function generator is connected to a PC to perform compiling of an upper computer program and the interface in the upper computer and open the upper computer in the PC; the upper computer program opens the arbitrary-function generator to obtain the control parameters of the interface; and the obtained parameters are assembled to frames, and the arbitrary-function generator outputs signals; and the output signals are transmitted to a CAN bus transceiver to obtain fault signals. The method for generation fault signals through the bus signal fault simulation device based on the CAN is used in the fault signal field.