Baking-free brick as well as preparation method and application thereof

The invention belongs to the technical field of building materials, and discloses a baking-free brick and a preparation method and application thereof, the baking-free brick comprises the following components by weight: cement, gravel powder, river sand, fly ash and water; the ratio of the cement to the gravel powder to the river sand to the fly ash to the water is 1: 2.4: 0.4: 0.4: 1; the particle size of the crushed stone powder is less than or equal to 3mm, and the silt content is less than or equal to 3%; the grain size of the river sand is less than or equal to 5mm, and the silt content is less than or equal to 3%; weighing the materials, putting the crushed stone powder, the river sand, the fly ash and the cement into a mixing mill, adding water, and uniformly mixing and milling; and conveying the materials mixed and ground by the mixing and grinding machine into a mold, pressing the materials into building blocks with the length of 240mm, the width of 115mm and the height of 53mm by a brick press, and