A back plate for a backlight module, comprising a main body portion, the main body portion having a first main surface and a second main surface opposite to each other, wherein, the main body portion is provided with a hollow structure , the hollow structure is configured for passing the light source of the backlight module through the hollow structure from the second main surface side of the main body portion , and for exposing the light-emitting portion of the light source on the first main surface side of the main body portion , the hollow structure is provided at a portion of the main body portion close to a first edge thereof, and the back plate further comprises a first bent portion bent from the first edge of the main body portion toward the first main surface side, and a second bent portion bent from an edge of the first bent portion away from the main body portion toward a middle portion of the main body portion , the second bent portion and the main body portion are spaced apart from each other and at least partially overlap in a direction perpendicular to the first main surface , and the hollow structure extends parallel to the first edge, a portion of the main body portion close to the first edge includes a step structure, so that the main body portion is divided into a first portion and a second portion that are staggered in a direction perpendicular to the first main surface , and the hollow structure is located in the first portion, characterized in that, as seen from a plan-view diagram parallel to the first main surface of the main body portion , the hollow structure includes a strip structure extending along the first edge of the main body portion , and a plurality of protrusion structures protruding from the strip structure toward the first edge and arranged at intervals in a direction parallel to the first edge. wherein, the main body portion is provided with a hollow structure , the hollow structure is configured for passing the light source of the backlight module through the hollow structure from the second main surface side of the main body portion , and for exposing the light-emitting portion of the light source on the first main surface side of the main body portion , the hollow structure is provided at a portion of the main body portion close to a first edge thereof, and the back plate further comprises a first bent portion bent from the first edge of the main body portion toward the first main surface side, and a second bent portion bent from an edge of the first bent portion away from the main body portion toward a middle portion of the main body portion , the second bent portion and the main body portion are spaced apart from each other and at least partially overlap in a direction perpendicular to the first main surface , and the hollow structure extends parallel to the first edge, a portion of the main body portion close to the first edge includes a step structure, so that the main body portion is divided into a first portion and a second portion that are staggered in a direction perpendicular to the first main surface , and the hollow structure is located in the first portion, characterized in that, as seen from a plan-view diagram parallel to the first main surface of the main body portion , the hollow structure includes a strip structure extending along the first edge of the main body portion , and a plurality of protrusion structures protruding from the strip structure toward the first edge and arranged at intervals in a direction parallel to the first edge. <EOS>