Labor says the $107.8 million investment will help fix delays in ambulance response times and take pressure off overburdened crews.
The 278 paramedics and 72 ambulance officers will be recruited over the next four years, starting in the next financial year.
Most will be based in Adelaide with 151 to be deployed across country locations including Mount Barker, Victor Harbor, Goolwa, Strathalbyn, the Limestone Coast and the Upper Spencer Gulf.
The commitment comes on top of Labor's promise to build a $120 million central SA Ambulance Service headquarters in Adelaide.
"For too long the Liberals have ignored the ambulance ramping crisis, which in turn has caused delays in ambulance response times and led to burn-out in paramedics and ambulance officers," Opposition Leader Peter Malinauskas said.
"We know we need to look after our emergency responders who do some of the most difficult and challenging work in caring for our community.
"Labor will invest in this vitally important service for South Australians, boosting numbers of paramedics and ambulance officers and providing new infrastructure."
In its latest campaign pledge on Monday, the Liberal government said it would spend $19 million to improve bus services to the Adelaide Hills.
The package includes $10 million for a fleet of 15 higher-performance buses to operate an express service between Adelaide and the hills.
"Faster and more regular services, together with improved park and ride facilities, will make public transport a much more attractive option for people commuting between the hills and the city," Transport Minister Corey Wingard said.
"More people using these new, high-frequency bus services will mean fewer cars on the freeway, and so a smoother, faster and less congested journey for all commuters."
South Australians go to the polls on March 19.
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