The announcement comes just one day after Labor's $20 million commitment to build the precinct.

It's said the precinct will assist in driving defence research and development projects and create up to 58 additional jobs in Launceston during construction.

Moreover, an estimated 150 jobs will be created in the region each year under the initiative, according to the Coalition.

Prime Minister Scott Morrison said the government would invest $30 million into the first phase of the defence precinct.

The precinct is expected to be a key plank in the Coalition's $90 billion naval shipbuilding plan.

"Our plan for a strong economy means we're backing Tasmania's defence industries and naval capability with a $30 million investment," Mr Morrison said.

"Our focus is on delivering more jobs for Tasmanians."

Mr Morrison said the precinct would bring together Tasmanian industry and academia and, in so doing, make the case for more prime defence contractors and research organisations to bring further jobs to the state.

Mr Morrison and Deputy Prime Minister Michael McCormack will be in Tasmania today to announce the funding, as well as a $100 million contribution to the roll-out of Tranche 3 of the Tasmanian Irrigation Scheme.

It comes one month after federal Labor itself committed $100 million to the rolling out of Tranche 3, should it win government.

The focus of Tranche 3 will be on five priority projects: the Fingal Irrigation Scheme, the Northern Midlands Irrigation Scheme, the Tamar Irrigation Scheme, the Don Irrigation Scheme and the Sassafras Wesley Vale Irrigation Scheme augmentation.

Mr McCormack, the leader of the National Party, said the North, North-West, central and South-East regions of the state were all set to benefit as a result of the next stage of the scheme and that it would mean "farmers can invest with certainty".

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