The utility model provides a height -adjustable's shed roof lamp, include: lamp holder, light source subassembly, drive assembly, lamp shade, insulating part and height adjusting piece, the coaxial setting of lamp shade and insulating part, height adjusting piece along the axial setting between lamp shade and insulating part to be connected with lamp shade and insulating part respectively, be provided with in the insulating part and place drive assembly's space to has an intercommunication extremely the installation interface in space, the lamp holder is connected with the insulating part through the installation interface, and with drive assembly's anodal and negative electricity connection, the lamp shade is first opening face along axial one end, the light source subassembly sets up inthe space that the lamp shade surrounded to the light -emitting of light source subassembly face to first opening face, be equipped with the passageway of stepping down that the power supply line passes through in the height adjusting piece, light source subassembly and the drive assembly electric wire electricity in through the passageway of stepping down is connected.