The invention discloses an adjusting module based on variable curvatures and an arc-shaped LED display screen spliced from the adjusting module. The adjusting module comprises a first part and a second part, wherein the first part consists of angle adjusting components; the second part consists of positioning and locking components; the first part comprises a sliding set and a fixed angle set; the second part comprises a buckle set and a safety anti-loosing set. The invention further discloses the arc-shaped LED display screen based on the variable curvatures. The arc-shaped LED display screen comprises a plurality of unit boxes and a plurality of adjusting modules based on the variable curvatures. A right fixing block on the first part and a left fixing block on the second part are respectively mounted on adjacent sides of each unit box body, the adjusting module is adopted for angle adjustment and locking and positioning on adjacent unit box bodies, and the arc-shaped LED display screen of which the angle can be randomly varied within the range of 10 degrees can be formed. The adjusting module has the advantages of high universalization degree, applicability to multiple mounting situations, convenience in assembly and disassembly, high bearing capacity and solidness, adjustable radian and seamless splicing.