The invention relates to an arc-shaped lithium ion secondary battery and a manufacturing method thereof. The battery is processed into an arc shape through a bending jig; at least one of a battery length direction and a battery width dimension is smaller than 15 mm; a ratio of bent arc length of the arc shape to the maximum curvature radius of the bent part is between 1.5 and 5; and after the battery is repeatedly bent by smaller than or equal to 5 times, a change rate of direct-current internal resistance and capacity of the battery is smaller than 10%. The invention further discloses a manufacturing method for the arc-shaped lithium ion secondary battery. The battery is small in battery dimension, is relatively great in the ratio of the arc length to the curvature radius, and can be effectively put into wearable equipment with a small size; and the battery is high in reliability, is not liable to bend when assembling apparatus, is more convenient to use, and has a higher yield.