The invention discloses a bottle cap anti-counterfeiting device. The bottle cap anti-counterfeiting device comprises a tube base, wherein the tube base is of a cylindrical shell; the upper surface ofthe tube base is provided with a convex arc surface; a through hole is formed in the middle of the arc surface of the tube base; the upper end of the tube base is provided with an upper cap; the lowersurface of the upper cap is provided with a concave arc surface matched with the convex arc surface of the tube base; and a soft plug is arranged on a position of the concave surface, opposite to thethrough hole, of the upper cap. The bottle cap anti-counterfeiting device has a simple structure; through cooperation of the upper cap and the tube base, sealing is realized; the upper cap is slid and turned along the tube base, so that the upper cap is convenient to open; due to the soft plug, the overall airtightness is ensured; through coordination of the upper ends of inserting plates and slots, locking of the tube base and the upper cap is realized; the inserting plates can be broken along the positions of lateral grooves, so that limitation is released; due to design of an internally-arranged locking piece, unartificial collision damage is avoided, and the use strength is improved; through rotation of a twist ring, control of the inserting plates is realized, opening is convenient,the upper cap is not rigidly limited after the upper ends of the inserting plates are broken, and use situations of the bottle cap can be effectively distinguished, so that counterfeit prevention is realized.