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.