The invention provides a disc buckle assembly device and relates to a disc buckle. By means of the disc buckle assembly device, the problem that disc buckles are not easy to assemble in the prior artis solved. The disc buckle assembly device comprises an upper clamp and a lower clamp. The lower clamp is provided with a positioning abutting mold for fixing a to-be-assembled product. The upper clamp is provided with a lower pressing plate capable of lifting relative to the positioning abutting mold. The lower pressing plate is provided with a pressing rod, and the pressing rod is controlled bya telescopic mechanism to stretch out and retract back relative to the lower pressing plate. A casing pipe is arranged at the end portion of the pressing rod. One end of the casing pipe is connected with the end portion of the pressing rod. A telescopic head is arranged in a pipe cavity of the other end of the casing pipe in a sliding fit mode. A first spring is arranged between the telescopic head and the other end of the casing pipe. The portion, between the casing pipe and the lower pressing plate, of the pressing rod is sleeved with a second spring. By means of a fixing and pushing mechanical mechanism, buckles can be assembled to the specified points conveniently and accurately, and the disc buckle assembly device has the advantages of being capable of achieving grabbing, simple in structure, convenient to operate, low in cost and capable of greatly improving the efficiency.