The invention relates to a voltage stabilizing protector for a power supply cabinet, which is characterized in that the voltage stabilizing protector comprises a rectifying unit, a monitoring unit, avoltage stabilizing reference unit, a comparison unit and a protection unit connected in sequence. The voltage stabilizing protector of the power supply cabinet of the invention can be applied to bothindustrial and civil electric equipment, and can reliably cut off the power supply to protect the subsequent electric equipment at the time when the overvoltage and undervoltage occur, thereby ensuring the safe operation of the electric equipment under the adverse environment of industrial or civil power supply.