HDMI interface protection circuit, circuit board and HDMI equipment

The invention relates to the technical field of HDMI, and discloses an HDMI interface protection circuit, a circuit board and HDMI equipment, the HDMI interface protection circuit can comprise a multi-dimensional level conversion protection circuit and an HDMI processing chip, the multi-dimensional level conversion protection circuit receives direct current signals and overvoltage signals sent by an HDMI input interface and an HDMI output interface, and outputs the direct current signals and the overvoltage signals to the HDMI processing chip; the received first multi-dimensional signal sent by the first module is converted into a corresponding second multi-dimensional signal, and then the second multi-dimensional signal is sent to the second module; wherein when the first module is an HDMI input interface or an HDMI output interface, the second module is an HDMI processing chip, and when the first module is an HDMI processing chip, the second module is an HDMI output interface or an HDMI input interface. The