The four-indent pneumatic cable crimping tool adopts curve propulsion mechanism. The output force is given to the crimp handle by the cylinder, and then the four curves of the head of the crimp handle transmit the force to the four indenters. The four indenters do the centripetal linear motion to crimp the contact to complete the crimping process. The synchronized action of four indenters assures the consistency of impression and the crimping quality of wires and contacts.