A support frame for an LED display screen, wherein the LED display screen comprises a plurality of splicing units that are spliced to each other, and the support frame comprises: a first rod extending in a first direction; and a bracket, wherein the bracket is connected to the first rod; and the bracket comprises: a second rod extending in a second direction, wherein one end of the second rod is connected to the first rod; and a first connection assembly, wherein the first connection assembly is connected to the other end of the second rod; and the first connection assembly comprises: a connection portion, configured to form a detachable connection with the splicing unit, wherein the connection portion is disposed at the other end of the second rod, and the connection portion, relative to the splicing unit, has at least a locking position and an unlocking position that are switchable; when the connection portion is in the locking position, the splicing unit and the connection portion are relatively fixed in a direction perpendicular to a connection plane of the splicing unit; and when the connection portion is in the unlocking position, the connection portion is detachable relative to the splicing unit; and a first positioning portion, wherein when the connection portion is in the locking position, the first positioning portion cooperates with the connection portion and secures the connection portion to the locking position; characterized in that, the first connection assembly further comprises a first shaft, and the connection portion is rotatably connected to the first shaft. a first rod extending in a first direction; and a bracket, wherein the bracket is connected to the first rod; and the bracket comprises: a second rod extending in a second direction, wherein one end of the second rod is connected to the first rod; and a first connection assembly, wherein the first connection assembly is connected to the other end of the second rod; and the first connection assembly comprises: a connection portion, configured to form a detachable connection with the splicing unit, wherein the connection portion is disposed at the other end of the second rod, and the connection portion, relative to the splicing unit, has at least a locking position and an unlocking position that are switchable; when the connection portion is in the locking position, the splicing unit and the connection portion are relatively fixed in a direction perpendicular to a connection plane of the splicing unit; and when the connection portion is in the unlocking position, the connection portion is detachable relative to the splicing unit; and a first positioning portion, wherein when the connection portion is in the locking position, the first positioning portion cooperates with the connection portion and secures the connection portion to the locking position; characterized in that, the first connection assembly further comprises a first shaft, and the connection portion is rotatably connected to the first shaft. a second rod extending in a second direction, wherein one end of the second rod is connected to the first rod; and a first connection assembly, wherein the first connection assembly is connected to the other end of the second rod; and the first connection assembly comprises: a connection portion, configured to form a detachable connection with the splicing unit, wherein the connection portion is disposed at the other end of the second rod, and the connection portion, relative to the splicing unit, has at least a locking position and an unlocking position that are switchable; when the connection portion is in the locking position, the splicing unit and the connection portion are relatively fixed in a direction perpendicular to a connection plane of the splicing unit; and when the connection portion is in the unlocking position, the connection portion is detachable relative to the splicing unit; and a first positioning portion, wherein when the connection portion is in the locking position, the first positioning portion cooperates with the connection portion and secures the connection portion to the locking position; characterized in that, the first connection assembly further comprises a first shaft, and the connection portion is rotatably connected to the first shaft. a connection portion, configured to form a detachable connection with the splicing unit, wherein the connection portion is disposed at the other end of the second rod, and the connection portion, relative to the splicing unit, has at least a locking position and an unlocking position that are switchable; when the connection portion is in the locking position, the splicing unit and the connection portion are relatively fixed in a direction perpendicular to a connection plane of the splicing unit; and when the connection portion is in the unlocking position, the connection portion is detachable relative to the splicing unit; and a first positioning portion, wherein when the connection portion is in the locking position, the first positioning portion cooperates with the connection portion and secures the connection portion to the locking position; characterized in that, the first connection assembly further comprises a first shaft, and the connection portion is rotatably connected to the first shaft.