The invention discloses a signal folding method of a lithium battery. The signal folding method is characterized by comprising the following steps of (1) placing the lithium battery at a right-angle edge of a platform, wherein a binding edge of the lithium battery faces outwards; (2) moving a triangular press block to an internal segment of the binding edge of the lithium battery, and pressing the triangular press block on a square sliding block; (3) upwards moving a folding block along an inclined surface of a triangular fixed block in an inclining way, bending and attaching an external segment of the binding edge of the lithium battery onto an inclined surface of the triangular press block, and simultaneously coating glue on an outer side surface of the external segment of the binding edge of the lithium battery by a gluing roller on the folding block; (4) forwards or backwards moving the triangular press block to leave a part right above the square sliding block, and resetting the folding block; (5) downwards moving the folding block, folding the external segment of the binding edge of the lithium battery towards the internal segment of the binding edge of the lithium battery, and resetting the folding block; and (6) upwards moving the square sliding block, and pasting the binding edge of the lithium battery onto a side surface of the lithium battery to achieve folding, gluing and pressing of the binding edge of the lithium battery.