A hidden self-locking metal plate uncoiler transition conveying device, including a base, a set of vertical plate groups are fixedly installed on both sides of the top surface of the base, each set of vertical plate groups is composed of two vertical plates arranged in front and back, and a horizontal long strip plate Composition, the bottom of the riser is fixedly connected with the top surface of the base, the long strip is located above the riser and fixedly connected with the top of the riser, a set of screw sets are arranged on both sides of the top of the base, each set of screw The group consists of two screw mandrels, two screw nuts, two sprockets, chains and power units arranged in front and back. Through the adjustment of the two sets of vertical plates, the metal plate can be moved to the next process, avoiding the metal plate being suspended in the air, avoiding the distortion of the metal plate, and preventing the occurrence of misalignment. The metal plate is used to meet the production needs of different metal plates, and the operation is simple, the use is convenient, and the promotion is more convenient.