The invention provides a method for automatic control of the coil height in the coil gathering process, which uses coil gathering accumulation height real-time calculation module and control module for performing real-time calculation and control on the running sequence and running speeds of a separating claw and a dropping tray. In particular, the method include the following steps: Step 1 when acoil head is detected at a cooling roller outlet position, a signal ON is given; Step 2 a first stage coil gathering accumulation height calculation module is turned on; Step 3 when the dropping trayis in place, a signal ON is given; Step 4 a second stage gathering cylinder coil accumulation height real-time control module is turned on to control the operation sequence of the dropping tray; Step5 when a coil tail is detected at a cooling roller outlet position, a signal ON is given; Step 6a third stage dropping tray rapid dropping control module is turned on to complete the coil gathering.The method does not need to add inner gathering cylinder equipment, and realizes constant control of coil height in the coil gathering process.