The invention discloses an alternating current servo direct drive electro-hydraulic pump, comprising a three-screw pump, a planetary gear mechanism, an alternating current servo motor and a motor drive controller, wherein the planetary gear mechanism is arranged at one ends of screws of the three-screw pump; the alternating current servo motor is arranged at the outer side of the three-screw pump and at one end in the axial direction of the three-screw pump, a motor rotor is fixedly connected with a case of the three-screw pump and rotates to drive the pump case to rotate, the pump case drives two driven screws to make autorotation and revolution around a driving screw through the planetary gear mechanism, and the driving screw is relatively fixed without rotation. By virtue of an alternating current servo motor direct drive technology, the three-screw pump and the driving motor are combined, thus significantly reducing the number and the whole size of transmission components and lowering overall noise. The alternating current servo direct drive electro-hydraulic pump has the advantages of compact structure, high operation efficiency, low leakage amount, low noise and the like, and is particularly suitable for cases with limit to size and with high requirement on noise.