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The collective excitations of a one-dimensional dipolar Bose-Einstein condensate trapped in an anharmonic potential are investigated theoretically.Using the variational approach,we obtain the coupled equations of motion for the center-of-mass coordinate of the condensate and its width.In particular,analytical expressions for the low-lying excitation modes are given.The results show that dipole-dipole interactions reduce the frequency shift induced by quartic distortion.The interplay between dipole-dipole interactions and anharmonic distortion for the collapse and revival of the collective excitations originating from the nonlinear coupling between the two modes are also discussed.