Three-dimensional alternating-current and direct-current electric field sensor

The invention discloses a three-dimensional alternating-current and direct-current electric field sensor. The sensor comprises a measuring probe (1), a connecting member (2), and a handheld display unit (3), wherein the measuring probe (1) is a three-dimensional alternating-current and direct-current electric field measuring probe based on an MEMS electric field sensitive device and includes detection electrodes (101) and an MEMS electric field measuring module (104) connected with the detection electrodes (101), the measuring probe (1) is used for sensing voltage signals in measured electricfield environment signals, and the detection electrodes (101) are arranged in a pairwise orthogonal mode; and the handheld display unit (3) is connected to the measuring probe (1) through the connecting member (2) and includes a control mainboard (304), and the control mainboard (304) is used for generating an alternating-current and direct-current driving voltage, providing the alternating-current and direct-current driv