The utility model discloses an embedded voltage sensor. The embedded voltage sensor comprises an auxiliary spring, a high-voltage divider, a high-voltage shielding case, a low-voltage shielding case and an embedded voltage sensor main insulation part, the high-voltage side of the high-voltage divider is provided with an auxiliary spring, and the low-voltage side of the high-voltage divider is provided with a wiring nut. A low-voltage shielding case and a high-voltage shielding case are sequentially arranged on the periphery of the high-voltage divider from inside to outside. The auxiliary spring, the high-voltage divider, the high-voltage shielding case and the low-voltage shielding case are cast together through the main insulation part of the embedded voltage sensor. The embedded voltagesensor is arranged in a main conductive loop insulating part of the power distribution switch equipment and is combined with the main conductive loop insulating part of the power distribution switchequipment into a whole in a spinning mode or a direct pressing-in mode. According to the utility model, the voltage sensor and an insulating part in the power distribution switch equipment are integrated, and the voltage sensor has the characteristics of small size, small partial discharge, uniform electric field distribution and convenient installation and replacement.