The African National Congress (ANC) is preparing for its grand finale, a rally to wrap up its election campaign, the party's head of elections and campaigning Fikile Mbalula said on Tuesday.

The Siyanqoba [We winning] rally, the "largest ever" held in South Africa, would take place at Coca-Cola Park and the Johannesburg Stadium simultaneously and is expected to draw around 120 000 supporters to hear ANC president Jacob Zuma address them for the last time before the April 22 polls.

"This is the Siyanqoba, we are approaching the final end, the beginning and the end which will be the 22nd of April," Mbalula told a media briefing at the party headquarters in Johannesburg.

The rally, to be linked via satellite to stadiums in the eight other provinces, is aimed at sending a "clear signal" that the ANC was ready to win a "decisive majority" in the election, Mbalula said, refraining from elaborating on what the party perceived as
"decisive".

"We are talking about a decisive victory and if that decisive victory gives us a two-thirds it will be happy Christmas for all of us in the ANC," he said.

"All what we have asked from our people is to basically give us the mandate to continue to do things... [to carry out] our priorities [outlined in the party's manifesto] and for us to do that we will need a decisive victory," he said.

He said the party had conducted a "positive campaign", while most opposition parties had sought to "vilify, demonise and ridicule" individual leaders.

Responding to questions on the Democratic Alliance's (DA's) "Stop Zuma" posters, Mbalula said Zuma was the people's choice.

"The question is that, how can they stop the tsunami? How can you stop what the people want? It is the people's leader. The DA is on the opposite of what is wanted by our people.

"He's not an armchair leader... what we give to our people is not fake, what you see is what you get. Mshini Wam' and the laughter is the innocence of what Zuma represents," he said.

While Mbalula was confident of an ANC win, he said the party would not be complacent.

"We know that elections are only won on election day," he said.

ANC leaders were being mobilised behind a "final push" to ensure every voter casts their ballot for the ruling party.