Detection circuit of video transmission cable and video output chip

The invention discloses a detection circuit of a video transmission cable and a video output chip. The detection circuit of the video transmission cable comprises a direct current power source, a first switching group, a first resistor, a second resistor, a third resistor, a second switching group and a first comparator. The first switching group comprises a first switch and a second switch. The first end of the first resistor is connected with the direct current power source, and the second end of the first resistor is connected to a detection opening through the first switch. The second switching group comprises a third switch, the first end of the third switch is used for being connected with an application processor of a mobile device, and the second end of the third switch is connected to a first node. The first input end of the first comparator is connected to the first node, and the second input end of the first comparator is connected to a second node. The detection circuit solves the problem that cable type detection is inaccurate for video transmission in the prior art, and the effect of improving the detection precision of the video transmission cable is achieved.