The invention relates to a leather-imitated thin-fold-line superfine synthetic leather and a preparation method for imitated leather thin-fold-line superfine synthetic leather, belonging to the technical field of synthetic leather and the preparation method of the synthetic leather. The preparation method comprises the following steps of: 1, machining short fibers of superfine fibers; 2, machining a non-woven fabric; 3, machining an ironing cloth; 4, machining a superfine fiber base cloth; 5, processing imitated leather; and 6, carrying out water rubbing and leather throwing treatment. According to the leather-imitated thin-fold-line superfine synthetic leather and the preparation method for the synthetic leather, a preparation process is simple, and the leather-imitated thin-fold-line superfine synthetic leather with fine and smooth textures, no rough fold lines and darts, and a good leather feeling can be prepared.