The utility model belongs to the equipment monitoring technical field and relates to a low-voltage equipment monitor. The low-voltage equipment monitor provided by the utility model can acquire current and voltage of a power grid and control electrical equipment to be timely isolated from the power grid. The low-voltage equipment monitor of the utility model comprises a real-time clock part, a debugging communication serial port part, an internal serial memory, a voltage acquisition circuit, a current acquisition circuit, a system power supply part, a USB communication port, a control output circuit and a single-chip microcomputer. The low-voltage equipment monitor is characterized in that a signal transmission port of the real-time clock part is connected with a clock port of the single-chip microcomputer; a receiving and transmitting port of the debugging communication serial port part is connected with a debugging signal receiving and transmitting port of the single-chip microcomputer; a data transmission port of the internal serial memory is connected with a data storage transmission port of the single-chip microcomputer; a signal input port of the voltage acquisition circuit is connected with a voltage acquisition port of the power grid; and a signal output port of the voltage acquisition circuit is connected with a voltage acquisition signal input port of the single-chip microcomputer.