The utility model discloses a screw pump packing box with adjustable, reducible screw pump change the number of times of packing, extension screw pump well open the well time rate and screw pump life. The utility model discloses an adjusting gland and packing box body, adjusting gland and packing box body threaded connection, packing box body traditional chinese clothing has the compaction packing ring, and the regulating press is covered and is equipped with adjusting bolt. The utility model discloses can coordinate instrument commonly used, realize the incessantly inside compaction packing ring of well adjustment packing box, make its compaction packing, solve because of the packing box oil spilling problem that packing wearing and tearing, the increase of sealed clearance led to the fact, reduce the change and the opening of screw pump of packing and stop the number of times, pump period is examined to extension screw pump well, reduces the oil well operation expense, improves rate when opening the well.