Disclosed is a tube lamp, comprising a mounting box and a lamp body matched with the mounting box, the mounting box comprising a top plate and side wall boards around the top plate; the tube lamp also comprises a fixed board; the fixed board comprises a fixed board body; at least two sets of fasteners are disposed at the two ends of the fixed board body; the fasteners are interspaced; the fixed board is detachably connected to the mounting box through the fasteners; and the lamp body is connected to the mounting box through the fixed board. At least two sets of fasteners are disposed at the two ends of the fixed board body; the fasteners are used for connection with the mounting box; the two sets of fasteners are interspaced, capable of being applied to many mounting boxes of different sizes, so the tube lamp has higher compatibility.