The invention relates to a method for reducing hydraulic jet fracturing and bursting pressures of a compact reservoir. If the reservoir is found out to be difficult to open by pressing due to the high fracturing pressure after primary sand jet perforation is carried out, a wellhead is instantly dismounted, and the direction of a tubular column is determined; the tubular column is lifted upwards or downwards, so that jetting points are staggered in a small distance, and secondary sand jet perforation is carried out; and cracks formed by jetting twice are communicated to form a larger crack, so that the fracturing pressure of the reservoir is reduced.