The invention provides a device for carrying out in-situ electrokinetic remediation and phytoremediation on heavy metal contaminated soil. The device comprises a power source, a cathode region, an anode region and a soil remediation region. The power source is a direct current power source. The cathode region comprises a cathode pump A, a cathode working fluid adding pipe, a cathode working liquid treating box, a cathode pump B, a cathode switch, a cathode working fluid draining pipe, a cathode electrode and a cathode electrode protecting pipe. The anode region comprises an anode pump A, an anode working fluid adding pipe, an anode working liquid treating box, an anode pump B, an anode switch, an anode working fluid draining pipe, an anode electrode and an anode electrode protecting pipe. The soil remediation region comprises a phytoremediation layer and an electrokinetic remediation layer. Super-enriched plants are planted in the phytoremediation layer.