She has previously announced plans to double free childcare to 30 hours a week for three and four-year-olds and eligible two year olds by the end of the parliament.
Ms Sturgeon will tell SNP conference delegates the move would save working parents around £350 a month.
The First Minister is expected to argue the government “put our money where our mouth is” following concerns over funding for the pledge.
Announcing current spending of £420 million a year will will rise to £840 million by 2020 she will say: “This is a commitment unmatched anywhere else in the UK.
“And it’s the best investment we can make in Scotland’s future.”
Scottish Labour’s acting leader Alex Rowley said: Scottish Labour interim leader Alex Rowley MSP said: “Once again, Nicola Sturgeon has been forced to re-announce that education is her top priority – but the reality is schools are struggling under the SNP with 4,000 fewer teachers, 1,000 fewer support staff and an attainment gap that is as stubborn as ever.
“The situation is now so bad that she has been forced to re-announce a commitment made two years ago.”