A motherboard alarm system test circuit includes an infrared emitter, a memory, and a circuit board. The circuit board includes a memory slot, many edge connectors, an infrared receiver, a single chip computer, and a switch circuit. The memory slot includes many spaced metal sheets. One end of each metal sheet is electrically connected to one of the first golden fingers of the memory. Each edge connector is electrically connected to the other end of each metal sheet. The second golden fingers of the circuit board are electrically connected to the memory slot. The signal chip computer includes an input pin electrically connected to the infrared receiver. The switch circuit is electrically connected to the signal chip computer. The switch circuit controls an electrical connection between the plurality of metal sheets and the plurality of first golden fingers of the memory.