We propose to generate two-mode squeezed vacuum motional state of an intracavity trapped ion by taking the advantage of the dissipation of the cavity mode.At the first step,the steady and pure two-mode motional entanglement between two motional degrees of the cold ion is obtained by engineering the couplings of both the motional modes of the ion to the cavity field.Based on the first step,a two-mode squeezed vacuum motional state is then generated by manipulating the phases of the exteal laser pulses incident on the ion.