The utility model provides an electrical connection detection device, which is used for testing the connection condition between two connectors electrically connected in a mechanical connection mode,and comprises a power supply, a switch, an acousto-optic device, a first wiring terminal and a second wiring terminal, the power source, the switch and the acousto-optic device are connected in seriesthrough wires to form a detection circuit, and the first wiring terminal and the second wiring terminal are connected to the two sides of the detection circuit in series through wires respectively. The first wiring terminal is used for being connected with a first connecting body in the two connecting bodies; and the second wiring terminal is used for being connected with the second connecting body in the two connecting bodies. According to the device, the power supply, the switch, the acousto-optic device, the first wiring terminal, the second wiring terminal and the to-be-detected circuit form a series loop, and whether the first end and the second end of the to-be-detected circuit are in poor contact or open circuit can be known through an audio signal and an optical signal of the acousto-optic device in the device.