The stop in Brazil will be his first on a four-nation South American tour that includes Chile, Peru and Colombia. It comes as the continent feels the pinch of lessening Chinese demand for its commodities.
"We're moving into a different era, because China's economy is transforming to being consumer based and it's slowing down, so commodity prices are going down," said Kevin Gallagher, professor of international relations at Boston University with expertise in China's ties to Latin America.
China remains the top trading partner for Latin America and the Caribbean, with USD 112 billion of the region's exports heading to China in 2013, according to Gallagher. Li's trip is expected to herald big investments in infrastructure projects, though analysts caution such announcements don't always result in action.
Still, the timing for any influx of Chinese cash could not be better for Brazilians, whose economy is expected to shrink by at least 1 percent this year.
Additionally, a sweeping kickback scandal at state-run oil company Petrobras has implicated Brazil's biggest construction and engineering firms, freezing them out of credit markets and severely hamstringing their ability to complete existing infrastructure works or start new ones that Brazil desperately needs to streamline its exports of soy, iron ore and other goods.
It's expected that most of the labour would be carried out by Brazilian firms, though Chinese firms could bid on building some stretches.
Such a railway would drastically cut down the time and cost needed to move commodities to market, but experts also say given Brazil's infamous red tape on big infrastructure projects, it's likely many years away from being completed, if ever.
