The present invention relates to a twin-line zipline that allows a person to ride on a carriage suspended from two lines on an outdoor slope, such as a slope of a ski resort, and to enjoy leisure activities while freely descending from the highlands to the lowlands in the highlands. And a plurality of supports arranged side by side at a predetermined distance on both sides, a guide cable installed parallel to each other on the upper ends of the both supports, and a guide groove into which the guide cable is fitted, and traveling along the guide cable. A roller, a horizontal member connecting the rollers so that the rollers on both sides can idle, a carriage that runs in a manner of freely falling from a high ground to a low land when a person is hanging on the guide cable, and the horizontal member and the carriage A connecting member for rotatably connecting and the guide cable Having a guide groove to be fitted, and is configured to include a stem for connecting the horizontal member and the auxiliary roller and the auxiliary roller, the auxiliary roller for traveling along the surface of the cable guide that the rollers are not in contact so as to idle.
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