A side plate mounting structure, comprising: a side plate body ; a locking portion connected to the side plate body , the locking portion being provided with a locking position when connected, in use, to a mounting base, and an unlocking position when separated from the mounting base; wherein the side plate body is provided with a through hole , and a part of the locking portion is connected to a hole wall of the through hole , the other part of the locking portion is stretched to the unlocking position along a first direction, or the other part of the locking portion is reset from the unlocking position to the locking position along a second direction opposite to the first direction; wherein the locking portion comprises: a connecting plate , a first end of the connecting plate being connected to the hole wall of the through hole , and a second end of the connecting plate extending toward a hole center of the through hole ; and a locking beam , the locking beam being connected to the second end of the connecting plate , the locking beam being movable to the unlocking position along the first direction, or the locking beam being reset to the locking position along the second direction; characterized in that the locking portion comprises: a handle connected to the locking beam , wherein the handle is located on a side, away from the connecting plate along a hole center direction of the through hole , of the locking beam , and an outer surface of the handle is disposed at a distance from the hole wall of the through hole . a side plate body ; a locking portion connected to the side plate body , the locking portion being provided with a locking position when connected, in use, to a mounting base, and an unlocking position when separated from the mounting base; wherein the side plate body is provided with a through hole , and a part of the locking portion is connected to a hole wall of the through hole , the other part of the locking portion is stretched to the unlocking position along a first direction, or the other part of the locking portion is reset from the unlocking position to the locking position along a second direction opposite to the first direction; wherein the locking portion comprises: a connecting plate , a first end of the connecting plate being connected to the hole wall of the through hole , and a second end of the connecting plate extending toward a hole center of the through hole ; and a locking beam , the locking beam being connected to the second end of the connecting plate , the locking beam being movable to the unlocking position along the first direction, or the locking beam being reset to the locking position along the second direction; characterized in that the locking portion comprises: a handle connected to the locking beam , wherein the handle is located on a side, away from the connecting plate along a hole center direction of the through hole , of the locking beam , and an outer surface of the handle is disposed at a distance from the hole wall of the through hole . a connecting plate , a first end of the connecting plate being connected to the hole wall of the through hole , and a second end of the connecting plate extending toward a hole center of the through hole ; and a locking beam , the locking beam being connected to the second end of the connecting plate , the locking beam being movable to the unlocking position along the first direction, or the locking beam being reset to the locking position along the second direction; characterized in that the locking portion comprises: a handle connected to the locking beam , wherein the handle is located on a side, away from the connecting plate along a hole center direction of the through hole , of the locking beam , and an outer surface of the handle is disposed at a distance from the hole wall of the through hole . <EOS>