Abstract: A gun holster clamping structure installed between a fixed portion and a rotating holster of a gun holster for controlling the timing of rotating the gun holster comprises a clamping portion disposed on the rotating holster and having an end protruded towards the fixed portion, a latch portion disposed on the rotating holster and having an end protruded from the fixed portion and a gun handle, and another end abutting against the clamping portion for linking and displacing the clamping portion, such that the rotating holster can be rotated to draw out the handgun. Normally, the clamping portion clamps the rotating holster and prevents another party to draw out the handgun. If a user grips the gun handle and links the latch portion accordingly, the clamping portion can be released from the clamping function of the rotating holster, and the user can achieve a quick draw of the handgun.