The present invention relates to a terminal crimping machine capable of feeding different sized terminals, which includes a base body provided at a lower end thereof with a feeding platform for placement of terminal-chain; a punching mechanism having an upper crimper and a driving piece, the upper crimper capable of moving longitudinally on the base body; an adjusting mechanism provided with a fixing block and an adjusting screw, the fixing block fixed in the base body and the adjusting screw movably coupled on the fixing block; an auto-feeder having a fixing base disposed on a front side of the base body, and a first and a second driven pieces disposed in the fixing base in an interlocking manner, wherein the second driven piece driven by an elastic force to abut against the adjusting screw of the adjusting mechanism, and the second driven piece provided at an end thereof with a pushing block, the driving piece of the punching mechanism employed to drive the first driven piece, so as to enable the second driven piece to push terminals on the base body.