The invention discloses a horizontal type HDMI dual-flow-channel voltage withstand test production line which comprises a test workbench. The test workbench is provided with a front product conveying flow channel, a rear product conveying flow channel and a middle product conveying flow channel, the middle product conveying flow channel is provided with a product staggered separation workstation, a voltage withstand test workstation and an NG test elimination workstation, a product shifting workstation is arranged on one side of the middle product conveying flow channel, and a test display screen is arranged on one side of the rear product conveying flow channel. The voltage withstand test workstation is used for carrying out a voltage withstand test on four products at a time, test efficiency is increased by one time compared with an original front-end automatic assembling machine testing two products simultaneously, the original automatic machine produces 2 PCS every 1.5 S and has the productivity per hour of 4800 PCS/H, and an improved horizontal type HDMI dual-flow-channel automatic assembling machine can produce 2 PCS every 1.3 S and has the productivity per hour of 5538 PCS/H. The assembling efficiency of the horizontal type HDMI dual-flow-channel automatic assembling machine is greatly improved.