A video signal identification method, comprising: reading a first register to obtain a format value of an analog video signal received; in a case that the format value is shared by multiple formats of target analog video signals, for one of the multiple formats, configuring a second register corresponding to the one of the multiple formats according to the one of the multiple formats, detecting whether the analog video signal received is in a locked state after configuring the second register corresponding to the one of the multiple formats, in response to detecting that the analog video signal received is in the locked state after configuring the second register corresponding to the one of the multiple formats, determining the one of the multiple formats as the format of the analog video signal received, wherein detecting that the analog video signal received is in the locked state comprises detecting that a state of a Horizontal Phase Lock Loop Lock and a state of a Vertical Phase Lock Loop Lock of the analog video signal are both locked; and in response to detecting that the analog video signal received is not in the locked state after configuring the second register corresponding to the one of the multiple formats, for another one of the multiple formats, configuring a second register corresponding to the other one of the multiple formats according to the other one of the multiple formats, detecting whether the analog video signal received is in the locked state after configuring the second register corresponding to the other one of the multiple formats, until detecting that the analog video signal received is in the locked state, and stopping the second register configuration. reading a first register to obtain a format value of an analog video signal received; in a case that the format value is shared by multiple formats of target analog video signals, for one of the multiple formats, configuring a second register corresponding to the one of the multiple formats according to the one of the multiple formats, detecting whether the analog video signal received is in a locked state after configuring the second register corresponding to the one of the multiple formats, in response to detecting that the analog video signal received is in the locked state after configuring the second register corresponding to the one of the multiple formats, determining the one of the multiple formats as the format of the analog video signal received, wherein detecting that the analog video signal received is in the locked state comprises detecting that a state of a Horizontal Phase Lock Loop Lock and a state of a Vertical Phase Lock Loop Lock of the analog video signal are both locked; and in response to detecting that the analog video signal received is not in the locked state after configuring the second register corresponding to the one of the multiple formats, for another one of the multiple formats, configuring a second register corresponding to the other one of the multiple formats according to the other one of the multiple formats, detecting whether the analog video signal received is in the locked state after configuring the second register corresponding to the other one of the multiple formats, until detecting that the analog video signal received is in the locked state, and stopping the second register configuration.