A backlight module, comprising: a wire bunching device, a backplane and a light source provided on a side of the backplane, wherein the wire bunching device comprises: a base; and a top cap connected with the base to form a hollow structure running through the wire bunching device in a first direction; wherein the hollow structure is used for a wire material to pass through, an inner wall of the hollow structure at least comprises a first portion formed by the top cap and a second portion formed by the base, wherein the first portion and the second portion are respectively disposed to extend from one end of the hollow structure to the other end in the first direction, the backplane is provided thereon with a connection structure matching with the base of the wire bunching device, wherein the wire bunching device is connected with the backplane through the connection structure, the connection structure is an engagement structure, characterized in that, the engagement structure includes two protrusion portions and a concave portion provided on the protrusion portions; the two protrusion portions are provided facing each other on a main surface of the backplane opposite to a side on which the light source is provided, and protruding in a direction away from the main surface, and the concave portion is provided on sides facing each other of the two protrusion portions, wherein a first side of the base is provided with two protruding columns spaced apart, outer side walls of the two protruding columns which face away from each other are provided with a groove, and the groove is provided therein with a flange extending in a width direction of the groove; the wire bunching device is provided between the two protrusion portions, the two protrusion portions are respectively embedded into the groove from both sides of the base, and the concave portion is matched and engaged with the flange. a wire bunching device, a backplane and a light source provided on a side of the backplane, wherein the wire bunching device comprises: a base; and a top cap connected with the base to form a hollow structure running through the wire bunching device in a first direction; wherein the hollow structure is used for a wire material to pass through, an inner wall of the hollow structure at least comprises a first portion formed by the top cap and a second portion formed by the base, wherein the first portion and the second portion are respectively disposed to extend from one end of the hollow structure to the other end in the first direction, the backplane is provided thereon with a connection structure matching with the base of the wire bunching device, wherein the wire bunching device is connected with the backplane through the connection structure, the connection structure is an engagement structure, characterized in that, the engagement structure includes two protrusion portions and a concave portion provided on the protrusion portions; the two protrusion portions are provided facing each other on a main surface of the backplane opposite to a side on which the light source is provided, and protruding in a direction away from the main surface, and the concave portion is provided on sides facing each other of the two protrusion portions, wherein a first side of the base is provided with two protruding columns spaced apart, outer side walls of the two protruding columns which face away from each other are provided with a groove, and the groove is provided therein with a flange extending in a width direction of the groove; the wire bunching device is provided between the two protrusion portions, the two protrusion portions are respectively embedded into the groove from both sides of the base, and the concave portion is matched and engaged with the flange. a base; and a top cap connected with the base to form a hollow structure running through the wire bunching device in a first direction; wherein the hollow structure is used for a wire material to pass through, an inner wall of the hollow structure at least comprises a first portion formed by the top cap and a second portion formed by the base, wherein the first portion and the second portion are respectively disposed to extend from one end of the hollow structure to the other end in the first direction, the backplane is provided thereon with a connection structure matching with the base of the wire bunching device, wherein the wire bunching device is connected with the backplane through the connection structure, the connection structure is an engagement structure, characterized in that, the engagement structure includes two protrusion portions and a concave portion provided on the protrusion portions; the two protrusion portions are provided facing each other on a main surface of the backplane opposite to a side on which the light source is provided, and protruding in a direction away from the main surface, and the concave portion is provided on sides facing each other of the two protrusion portions, wherein a first side of the base is provided with two protruding columns spaced apart, outer side walls of the two protruding columns which face away from each other are provided with a groove, and the groove is provided therein with a flange extending in a width direction of the groove; the wire bunching device is provided between the two protrusion portions, the two protrusion portions are respectively embedded into the groove from both sides of the base, and the concave portion is matched and engaged with the flange.