A modular panel lamp, comprising a surface frame component (110, 03), a light source component (120, 04), a backlight component (130, 02), and a drive component (140, 05), wherein the light source component (120, 04) is connected with the surface frame component (110, 03), the backlight component (130, 02) is connected with the surface frame component (110, 03), and the drive component (140, 05) is connected with the light source component (120, 04); wherein the surface frame component (110, 03) comprises four profiles connected in an end-to-end manner, wherein the four profiles are detachably connected to form a frame body, and both the light source component (120, 04) and the backlight component (130, 02) are disposed in the frame body; the four profiles comprise a wire outlet profile, a first profile, a second profile, and a third profile; the wire outlet profile is disposed opposite to the first profile, and the second profile is disposed opposite to the third profile; and the wire outlet profile is provided with a wire outlet port, the wire outlet profile and the first profile are each further provided with a first fitting groove and a second fitting groove, the light source component (120, 04) is mounted in the first fitting groove, and the backlight component (130, 02) is mounted in the second fitting groove; the four profiles are connected by using corner members; and both ends of each of the profiles are provided with fixation engaging slots in which the corner members are mounted respectively; and the first profile comprises a first bottom wall, a top wall, and a side wall which are integrally molded, the first bottom wall and the top wall are oppositely disposed, and are both connected with the side wall to form a first groove; characterized in that: the first bottom wall is provided with a first bump, the top wall is provided with a second bump, and the first bump and the second bump are oppositely disposed so that the first groove is divided into the first fitting groove and the second fitting groove; a mounting portion is protruded from a side of the top wall close to the first bottom wall, the mounting portion is provided with the fixation engaging slot, the mounting portion, the second bump, and the first bottom wall collectively define the second fitting groove and serve the function of restricting the position of the backlight component. wherein the surface frame component (110, 03) comprises four profiles connected in an end-to-end manner, wherein the four profiles are detachably connected to form a frame body, and both the light source component (120, 04) and the backlight component (130, 02) are disposed in the frame body; the four profiles comprise a wire outlet profile, a first profile, a second profile, and a third profile; the wire outlet profile is disposed opposite to the first profile, and the second profile is disposed opposite to the third profile; and the wire outlet profile is provided with a wire outlet port, the wire outlet profile and the first profile are each further provided with a first fitting groove and a second fitting groove, the light source component (120, 04) is mounted in the first fitting groove, and the backlight component (130, 02) is mounted in the second fitting groove; the four profiles are connected by using corner members; and both ends of each of the profiles are provided with fixation engaging slots in which the corner members are mounted respectively; and the first profile comprises a first bottom wall, a top wall, and a side wall which are integrally molded, the first bottom wall and the top wall are oppositely disposed, and are both connected with the side wall to form a first groove; characterized in that: the first bottom wall is provided with a first bump, the top wall is provided with a second bump, and the first bump and the second bump are oppositely disposed so that the first groove is divided into the first fitting groove and the second fitting groove; a mounting portion is protruded from a side of the top wall close to the first bottom wall, the mounting portion is provided with the fixation engaging slot, the mounting portion, the second bump, and the first bottom wall collectively define the second fitting groove and serve the function of restricting the position of the backlight component. the first bottom wall is provided with a first bump, the top wall is provided with a second bump, and the first bump and the second bump are oppositely disposed so that the first groove is divided into the first fitting groove and the second fitting groove; a mounting portion is protruded from a side of the top wall close to the first bottom wall, the mounting portion is provided with the fixation engaging slot, the mounting portion, the second bump, and the first bottom wall collectively define the second fitting groove and serve the function of restricting the position of the backlight component.