A bracket lamp tube and a lamp head cover thereon are provided. The lamp head cover comprises a cover body (2) and a metallic needle (1) penetrating the cover body (2). The front end of the metallic needle (1) extends out of the outside of the cover body (2). The rear end of the metallic needle (1) is located inside the cover body (2) and is fixedly connected to a first metallic contact plate (3). A second metallic contact plate (5) separated from the first metallic contact plate (3) is provided inside the cover body (2). A third metallic contact plate (6) is provided between the first and the second metallic contact plates (3, 5) and is connected to a touch button (4). The touch button (4) is exposed outside the cover body (2). The first and the second metallic contact plates (3, 5) are electrically connected by the third metallic contact plate (6) as the touch button (4) is pressed. The metallic needle (1) and an internal ballast are disconnected when the lamp head cover is not connected to the lamp, and the L and the N poles of the ballast are connected for power supply by using the connection of the first and the second metallic contact plates (3, 5) when the lamp head cover is installed to a lamp socket.