LED display screen, limiting device of lock and lock for LED display screen

The utility model discloses an LED display screen, a limiting device of a lock and the lock for the LED display screen, and belongs to the technical field of LED display screens. The limiting device comprises an unlocking piece, a spring, a limiting cylinder and a limiting assembly, the unlocking piece is installed in the limiting cylinder, the spring is located between the unlocking piece and thelimiting cylinder, the unlocking piece and the limiting assembly are in linkage connection, the limiting assembly forms a limiting opening with a variable size, and the limiting assembly can be driven by the unlocking piece to move and can also be driven to move when a lock rod of the lock is inserted; the lock for the LED display screen comprises a lock rod and the limiting device, the lock rodcomprises a head portion and a limiting portion, the diameter of the limiting portion is smaller than that of the head portion, and the limiting assembly is matched with the limiting portion to achieve limiting locking of the