Buckling inducing-type vehicle crash boxes wherein the buckling inducing-type vehicle crash boxes are suitable to be arranged at both ends of a back beam, the buckling inducing-type vehicle crash boxes comprising: a box body part; and a reinforcing part, which is formed in a lattice shape, protrudes externally from an outer surface portion of the box body part, induces a buckling a longitudinal direction of the box body part 100 by external impact, and absorbs energy generated by the impact, wherein the reinforcing part includes: a plurality of main reinforcing members on which buckling inducing protrusions inducing the buckling are repeatedly formed along the longitudinal direction of the box body part, and spaced part from each other along a with direction of the box body part, and a plurality of auxiliary reinforcing members following the width direction of the box body part, spaced apart from each other along the longitudinal direction of the box body part, and intersecting with the plurality of main reinforcing members, wherein the buckling inducing protrusions are formed in corrugation shape, wherein one end of the box body part is suitable to be connected to the back beam the other end of the box body part is suitable to be connected to a vehicle body facing the back beam, characterised in that the respective buckling inducing protrusions are formed in a saw tooth shape and have cross sections which are a right-angled triangle shape and repeatedly connected to each other, and an inclined surface of each of the buckling inducing protrusions is downwardly inclined along and toward the other end of the box body part. a box body part; and a reinforcing part, which is formed in a lattice shape, protrudes externally from an outer surface portion of the box body part, induces a buckling a longitudinal direction of the box body part 100 by external impact, and absorbs energy generated by the impact, wherein the reinforcing part includes: a plurality of main reinforcing members on which buckling inducing protrusions inducing the buckling are repeatedly formed along the longitudinal direction of the box body part, and spaced part from each other along a with direction of the box body part, and a plurality of auxiliary reinforcing members following the width direction of the box body part, spaced apart from each other along the longitudinal direction of the box body part, and intersecting with the plurality of main reinforcing members, wherein the buckling inducing protrusions are formed in corrugation shape, wherein one end of the box body part is suitable to be connected to the back beam the other end of the box body part is suitable to be connected to a vehicle body facing the back beam, characterised in that the respective buckling inducing protrusions are formed in a saw tooth shape and have cross sections which are a right-angled triangle shape and repeatedly connected to each other, and an inclined surface of each of the buckling inducing protrusions is downwardly inclined along and toward the other end of the box body part. a plurality of main reinforcing members on which buckling inducing protrusions inducing the buckling are repeatedly formed along the longitudinal direction of the box body part, and spaced part from each other along a with direction of the box body part, and a plurality of auxiliary reinforcing members following the width direction of the box body part, spaced apart from each other along the longitudinal direction of the box body part, and intersecting with the plurality of main reinforcing members, wherein the buckling inducing protrusions are formed in corrugation shape, wherein one end of the box body part is suitable to be connected to the back beam the other end of the box body part is suitable to be connected to a vehicle body facing the back beam, characterised in that the respective buckling inducing protrusions are formed in a saw tooth shape and have cross sections which are a right-angled triangle shape and repeatedly connected to each other, and an inclined surface of each of the buckling inducing protrusions is downwardly inclined along and toward the other end of the box body part.