The invention relates to a lamp and a lamp holder module thereof. The lamp comprises the lamp holder module and a luminous module arranged on the lamp holder module, wherein the lamp holder module comprises a lamp holder main body, a pressing mechanism and an upper cover; the pressing mechanism is arranged on the lamp holder main body; the upper cover is separably clamped on the lamp holder main body; the luminous module can be placed on the lamp holder main body and is pressed and positioned through the pressing mechanism; the pressing of the luminous module can be relieved through the operation of the pressing mechanism, so that the luminous module can be disassembled and assembled conveniently; and the upper cover serving as the lens of the luminous module can be coated on the luminousmodule. The invention further provides the lamp holder module.