LED display screen circuit board capable of reducing splicing gaps and LED display device

The utility model relates to the technical field of LED display devices, and discloses an LED display screen circuit board capable of reducing splicing gaps and an LED display device.The LED display screen circuit board capable of reducing splicing gaps comprises a shell and a buckle assembly arranged on the side wall of the shell, the buckle assembly is connected with a display screen body, a fixing assembly is arranged in the shell, the fixing assembly is connected with a circuit board body, and the circuit board body is connected with the shell. A supporting assembly is arranged at the bottom of the shell, a groove is formed in the shell, and the buckle assembly is located in the groove; the buckle assembly comprises a first threaded rod, a rotating block, a pushing block, a clamping block, a connecting rod and a connecting plate, the first threaded rod is installed on the shell, the rotating block is installed at one end of the first threaded rod, and the end, away from the rotating block, of the first th