The invention discloses an angle-adjustable automotive wiring harness bending device, which is sequentially provided with a base and a bending main body from bottom to top, wherein the top of the bending main body is recessed downwards with a bending groove and a trunking which are staggered with each other, the depth of the bending groove is greater than that of the trunking, and the bottom of the bending groove is provided with a rebound mechanism; The rebound wire harness bending device is also provided with a punch, and the punch can reciprocate in the bending groove in the vertical direction to squeeze or stay away from the wire harness located in the wire slot; The bottom of the slot is provided with two adjusting plates, one end of each adjusting plate is connected to the bottom of the slot, and the other end extends to the outside of the slot respectively; A compression spring is arranged between the adjusting plate and the wire slot; An ear plate is arranged on the outer side wall of the bending main body, the top of the ear plate is lower than the bottom of the wire groove, and the ear plate is provided with a through groove; The bottom of the other end of the adjusting plate is provided with an adjusting rod which passes through the through groove downwards, and the bottom of the adjusting rod is provided with a fastener. The bending device can quickly bend the automotive wiring harness.