The invention discloses a safety control method and implementation device preventing coil overturning during coil discharging of a coiler. The technical problems difficult to solve in site in the prior art are solved, and especially the coil overturning accident that because counting of an encoder is not accurate during coil discharging of a pickling line tandem cold rolling mill, a steel coil collides with a stepping beam is avoided. By means of the method, whether the transverse movement and height centering positions of a steel coil trolley are right or not can be effectively judged, the position abnormity of the steel coil trolley can be found in time, and the coil overturning accident in the steel coil transporting process can be effectively avoided; and by adopting the method, the coil discharging effect can be effectively improved, and meanwhile the safety of coil discharging is effectively controlled.