The former Uttar Pradesh chief minister claimed that the next government at the Centre "cannot be formed" without BSP's support.
Slamming the BJP's prime ministerial candidate, Mayawati said: "There is no development in Gujarat, but Modi misguided the people of country in the name of development."
Attacking the Congress-led UPA government at the Centre, she claimed the government is curtailing the backward classes right to reservation "by allotting their share to others. The backlog of government jobs reserved for Dalits and the backwards is increasing day by day."
BSP has fielded candidates on all the ten Lok Sabha seats of Haryana.
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Mayawati alleged "both (Congress and BJP) have always worked against the interests of Dalits, backward class and the poor and framed policies which have made rich richer."
She said the Congress' UPA and BJP-led NDA have ruled the country for long, "but both the parties have failed to improve the lot of the poor people."
"A huge amount of black money is stashed in foreign banks, but they (Congress and BJP) have made no efforts to bring it back," she said.
"If this black money is brought back to our country, most of the problems faced by the poor, Dalits and tribals will be over in times to come."
She also lashed out at the Congress government in Haryana for having "failed" on all fronts and made a fervent appeal to the voters to vote for BSP candidates in the state.