Spokesman Sameh Ashour said the move was in response to an absence of guarantees that the polls would be transparent, AFP news agency reported.
It comes days after President Mohammed Morsi announced the date for the elections, to be held over four dates.
Judges dissolved the previous assembly, saying polls were unconstitutional.
The first round of voting in Cairo and four other provinces is due to be held on 22 April.
In the last elections, in January 2012, Islamist parties won a majority.
Egypt has since been deeply divided between Islamists and a liberal and secular opposition.
Last weekend, NSF leader Mohamed ElBaradei called for a boycott of fresh polls, branding them “a deception”.