The invention designs a compressed packer based double-sliding-sleeve type set locking mechanism. The mechanism comprises at least a center pipe, a first sliding sleeve, a second sliding sleeve and aprotecting cap, wherein the first sliding sleeve and the second sliding sleeve are fixedly connected through a plurality of first shear pins; the first sliding sleeve and the center pipe are fixed through second shear pins; a plurality of holes in which locking blocks are arranged are radially uniformly formed in the lower end of the center pipe; the locking blocks are outwards protruded on the center pipe and can radially move on the center pipe; the bottom part of the center pipe is connected to the protecting cap. According to the mechanism, a plurality of shortages of unstable performancesand invalid sand preventing function of an existing compressed packer structure that a setting mechanism is locked through the locking blocks can be overcome; the two sliding sleeve and the shear pins for fixing the two sliding sleeve are provided; the liquid level difference of an oil sleeve is controlled during drilling, so that the level of the liquid in an oil pipe is lower than the annular liquid level of the oil sleeve, and as a result, the water hammer pressure in a tool is decreased; in addition, the packer is prevented from setting in the middle of drilling through the double-sliding-sleeve type locking mechanism; and meanwhile, the sand preventing function is ensured.