The present disclosure discloses a system for preparing new energy Ni-Co-Mn raw material from laterite nickel Ore, the system includes modules such as raw auxiliary material supply, leaching reaction, neutralization and purification, Ni-Co-Mn mixed hydroxide synthesis, crystal manufacturing, ternary precursor manufacturing, and ternary positive material preparation. The present disclosure overcomes disadvantages of the prior art and process, in that the green technology and process for simultaneously extracting nickel and cobalt and manganese from a low-grade laterite nickel ore not only realizes simultaneous and efficient extraction of nickel and cobalt and manganese, but also adopts the green technology and clean production technology with energy saving and emission reduction to effectively and safely dispose of waste water, waste residue, and waste gas. The present disclosure has energy saving and carbon reducing and pollution reduction, implements a maximum comprehensive recovery of nickel and cobalt and manganese, effectively resolves a requirement contradiction of new energy source for strategy scarce resource of nickel and manganese, and completely meets a global green development and a dual-carbon economic trend.