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The invention relates to the field of oil well construction equipment, and discloses a hydraulic anchor for sand adding fracturing operation of an oil and gas well, the hydraulic anchor comprises a hydraulic anchor main body pipe and an anchor tile, the hydraulic anchor main body pipe is provided with a slip groove, the hydraulic anchor main body pipe is fixedly sleeved with a limiting batten located on the outer side of the slip groove, the slip groove is internally and movably sleeved with a sliding plate, and the sliding plate is connected with the anchor tile. The anchor tiles are fixedly connected to the two ends of the outer side of the sliding plate, and a rubber packing sleeve located between the two anchor tiles is arranged between the limiting batten and the sliding plate. Through the structural design of a sliding plate linked with an anchor tile in a slip groove, a rubber packing sleeve, a positioning through pipe, a matched linkage block and a middle sleeve, anchoring and canceling are conducted through water pressure, and compared with an existing hydraulic anchor, anchoring and canceling are conducted through water pressure, so that power is sufficient, the situation that when the anchoring is canceled through the elastic force of a spring is avoided, and the anchoring efficiency is improved. Due to the fact that limited elastic force of the spring is not enough for unfreezing, the sand-adding fracturing operation efficiency is affected.