Cylinder holder capable of stably clamping

The utility model discloses a stable-clamping cylinder holder which comprises a main support of a gantry-shaped structure, and attaching grooves of an inverted-V-shaped structure are formed in the bottom end faces of two side arms of the main support. Extension arms are symmetrically formed at the lower ends of the auxiliary supports, and upper inner sliding grooves and lower outer sliding grooves are formed in the surfaces of the extension arms respectively; a first connecting hinged shaft, a second connecting hinged shaft, a third connecting hinged shaft and a fourth connecting hinged shaft are arranged on the left side, the upper side and the right side of the clamping arms respectively, the second connecting hinged shaft and the third connecting hinged shaft are located in the upper inner sliding groove and the lower outer sliding groove respectively, a vertical groove is formed in the middle of the auxiliary support, a movable shaft capable of moving is arranged in the groove, and the movable shaft is ar