The invention discloses a non-autoclaved aerated concrete building block which contains portland cement, fly ash, mill calcium oxide powder, desulphurization plaster and foaming agent; the formulation is also added with trolamine, sodium sulfate, and naphthalene sulfonate formaldehyde condensate. The invention also discloses a manufacturing method for the non-autoclaved aerated concrete building block. The invention has the beneficial effects that the early-strength and water reduction combination of the trolamine, the sodium sulfate, and the naphthalene sulfonate formaldehyde condensate greatly increases the early strength development rate of the aerated concrete and brings benefits to the long-term strength development of the aerated concrete; the non-autoclaved aerated process fully utilizes the hydration heat evolution of the cement and dispelling heat evolution of the calcium oxide and carries out the normal pressure dampness-heat maintenance, obviously reduces the cost of the maintenance of equipment and the manufacture dissipation energy, and increases the manufacturing safety.