The invention discloses a protection circuit for a high definition multimedia interface HDMI, including a wireless receiving module, a signal processing module and a signal interface module. The wireless receiving module receives a radio frequency signal carrying an audio and video service. The signal processing module performs TDS-OFDM demodulation, decoding and synchronization processing on theradio frequency signal received by the wireless receiving module to obtain an audio and video signal, and outputs the audio and video signal. The signal interface module receives the audio and video signal output by the signal processing module. The protection circuit for the high definition multimedia interface HDMI provided by the invention is capable of receiving and processing radio frequencysignals with high reliability to obtain high-quality audio and video signals, has high device integration degree, and has the advantages of small convergence error and short convergence time.