The invention relates to a method for improving the coil shape quality of
hot rolled strip steel. The method comprises the steps of after the head part of a coiling
machine bites steel, delaying 21-36seconds, and starting to set a stopped state of the
tail part; after the
tail part throws steel, when the
tail part of the
strip steel leaving a pinch roll is detected, enabling the tail part to automatically stop and start to control, and enabling a coiling block to stop according to a retardation curve; when the tail part of the
strip steel enters a definite range from a starting stop position,determining a tail part stop position according to a pair tail conversion timing sequence; and after normal coiling is completed, adopting the appropriate uncoiling delaying time in the coiling
machine. The method has the advantages that after the coiling
machine bites steel at the heat part of the strip steel, the pair tail position pre-judgment of the tail part and the calculation and judgmentof automatic rotation angle after aligning delaying are introduced, the final uncoiling position can be selectively determined according to
operational requirements, and therefore the coil shape quality of the
hot rolled strip steel is improved, and the chance of flat coiling due to wear of the coiling block, insufficient tension,
insufficient cooling water capacity and large roll-gap deviation ofa wrapper roll is reduced.