The　many　pulses　homoclinic　orbits　with　a　Melnikov　method　and　chaotic　dynamics　for　the　nonlinear　nonplanar　oscillations　of　a　cantilever　beam　are　investigated　in　this　paper　for　the　first　time.　The　cantilever　beam　studied　here　is　subjected　to　a　harmonic　axial　excitation　and　two　transverse　excitations　at　the　free　end.　A　generalized　Melnikov　method　is　utilized　to　analyze　the　multi-pulse　global　bifurcations　and　chaotic　dynamics　for　the　nonlinear　nonplanar　oscillations　of　the　cantilever　beam.　The　analysis　of　global　dynamics　indicates　that　there　exist　the　multi-pulse　jumping　orbits　in　the　perturbed　phase　space　of　the　averaged　equation.　Numerical　simulations　are　given　to　verify　the　analytical　predictions.　It　is　also　found　from　the　results　of　numerical　simulation　in　three-dimensional　phase　space　that　the　multi-pulse　orbits　exist　for　the　nonlinear　nonplanar　oscillations　of　the　cantilever　beam.