A battery high voltage sampling circuit comprising a positive relay, a negative relay, a first positive sampling unit, a first negative sampling unit, a second positive sampling unit, a second negative sampling unit and a reference voltage terminal, wherein: a first terminal of the positive relay is connected to a positive electrode of a power battery pack to be detected, a first terminal of the negative relay is connected to a negative electrode of the power battery pack to be detected, and both of the first positive sampling unit and the first negative sampling unit are connected to the reference voltage terminal; the first positive sampling unit comprises a first switch and is configured to acquire a first positive sampled signal at the first terminal of the positive relay when the first switch is turned on; the first negative sampling unit comprises a second switch and is configured to acquire a first negative sampled signal at the first terminal of the negative relay when the second switch is turned on; both of the second positive sampling unit and the second negative sampling unit are connected to the reference voltage terminal; characterized in that: the second positive sampling unit comprises a third switch and is configured to acquire a second positive sampled signal of the power battery pack at a second terminal of the positive relay when the third switch is turned on; the second negative sampling unit comprises a fourth switch and is configured to acquire a second negative sampled signal of the power battery pack at a second terminal of the negative relay when the fourth switch is turned on; and the reference voltage terminal is a low voltage ground. a first terminal of the positive relay is connected to a positive electrode of a power battery pack to be detected, a first terminal of the negative relay is connected to a negative electrode of the power battery pack to be detected, and both of the first positive sampling unit and the first negative sampling unit are connected to the reference voltage terminal; the first positive sampling unit comprises a first switch and is configured to acquire a first positive sampled signal at the first terminal of the positive relay when the first switch is turned on; the first negative sampling unit comprises a second switch and is configured to acquire a first negative sampled signal at the first terminal of the negative relay when the second switch is turned on; both of the second positive sampling unit and the second negative sampling unit are connected to the reference voltage terminal; characterized in that: the second positive sampling unit comprises a third switch and is configured to acquire a second positive sampled signal of the power battery pack at a second terminal of the positive relay when the third switch is turned on; the second negative sampling unit comprises a fourth switch and is configured to acquire a second negative sampled signal of the power battery pack at a second terminal of the negative relay when the fourth switch is turned on; and the reference voltage terminal is a low voltage ground. the second positive sampling unit comprises a third switch and is configured to acquire a second positive sampled signal of the power battery pack at a second terminal of the positive relay when the third switch is turned on; the second negative sampling unit comprises a fourth switch and is configured to acquire a second negative sampled signal of the power battery pack at a second terminal of the negative relay when the fourth switch is turned on; and the reference voltage terminal is a low voltage ground.