The invention discloses a supporting plate controlling method in high speed wire rod production, belongs to the technical field of wire rod production process, and aims to provide a supporting plate controlling method convenient to control and capable of increasing the finished coil quality in high speed wire rod production. The method comprises the following steps: 1, an SM roller way operates, the head of a coil reaches a coil collecting cylinder, and a detecting switch is lightened; 2, a supporting plate enters a working state, and falls down at low speed; 3, the falling height of the supporting plate is judged; 4, the supporting plate falls down at high speed, so as to finish the coil collecting operation. The method provided by the invention is applicable to various high speed wire rod production lines.