The utility model discloses a single-slot cartridge clip holder comprising a front housing, a rear housing, positioning rack slots, adjustable rack arms and a screw hole, wherein the adjustable rack arms are arranged at two sides of the front housing, the rear housing is mounted at a rear part of the front housing, the positioning rack slots matching the adjustable rack anus are arranged at two sides of the rear housing, a slidably adjustable mounting hole is arranged at a middle part of a connection between the front housing and the bottom of the rear housing, an integrally formed pressure elastic piece is arranged at an inner side of the rear housing, and positioning screw holes are arranged at two sides near a top end of a pressure elastic piece.