Anti-detection combination lock

An anti-detection combination lock, comprising:

• a lock seat, comprising a base and a lock core installed on the base;
• a plurality of numeral wheels, arranged spacedly on the base, each numeral wheel comprising a lower gear and an upper gear stacked coaxially, and part of a periphery of the lower gear protruding from one side of the base;
• an anti-detection piece, arranged on the base, comprising a main rod and a plurality of branch rods connected to the main rod, and each branch rod located on one side of each upper gear;
• a panel, covering the base, a plurality of numeral holes and an opening defined on the panel, and the numeral holes disposed corresponding to the numeral wheels;
• and
• a knob, arranged on one side of the anti-detection piece, connected to the lock core and protruding from the opening;
• a plurality of flexible rings, wherein each flexible ring encloses each upper gear;
• wherein the knob is being rotated to push the anti-detection piece to move toward the numeral wheels to make the branch rods abut against each upper gear to make a plurality of lower gears be nonrotatable;
• wherein the base comprises a positioning plate, a plurality of through holes are defined on the positioning plate, and each numeral wheel is disposed on each through hole;
• wherein each branch rod comprises a latch portion located on a side thereof facing each upper gear, and each upper gear is pressed by the latch portion to be nonrotatable.