The invention relates to an automatic connecting method for broad-band power line carrier module detection. According to the method, a loading assembly line, an unstacking machine, an electromagneticshielding box, a conveying line, a stacking machine, an under-fill box buffering conveying line, a six-axis manipulator and a defective product conveying line are included, and circulating boxes containing to-be-detected broad-band power line carrier modules are conveyed sequentially to pass through the loading assembly line, the unstacking machine, the electromagnetic shielding box, the conveyingline and the stacking machine. The method is characterized in that a detection module is mounted in the electromagnetic shielding box; and the detection module is used for detecting multiple properties of the broad-band power line carrier modules and has the detection frequency band ranging from 2 MHz to 20 MHz. Whole stacks of the broad-band power line carrier modules are split automatically after being output, and qualified products are stacked automatically and are connected with a warehousing system, so that the manpower resource input during module unstacking and stacking is reduced, thelabor intensity is reduced, the method is suitable for batch detection of the modules, and improvement of the efficiency of the whole module detection system is guaranteed.