Low-voltage phase checking device

The utility module relates to a low-voltage phase checking device. The low-voltage phase checking device comprises a phase A/D conversion unit which is used for receiving external three-phase power supply, wherein the phase A/D conversion unit is connected with a first signal processing unit through a signal comparision unit. The first processing unit is connected with an indicating unit and an output unit respectively. The low-voltage phase checking device according to the utility model has the following functions: effectively improving phase checking detection accuracy, reducing error, performing definite indicating and display functions. Furthermore individual auxiliary equipment is not required. Cost of equipment and manpower is reduced. Because the low-voltage phase checking device performs production with routine material and technique, the low-voltage phase checking device has the following advantages: low production cost, small volume, simple operation and high carrying convenience.