The invention discloses fabricated blocks, a fabricated-block building
system and a construction method thereof. The fabricated blocks comprise a main block and auxiliary blocks, wherein the auxiliary blocks comprise 1 / 2 blocks, T-shaped node blocks, corner blocks and end blocks; the main block is composed of two parallelly-arranged long transverse ribs and at least two short longitudinal ribs perpendicularly connected between the two long transverse ribs; the two ends of the main block are both in an H-shaped
open structure, the main block is in mortise-and-tenon joint with a block (horizontally adjacent to the main block) by virtue of a tenon and a
rabbet, and simultaneously a vertical through hole is formed between the main block and the block (horizontally adjacent to the main block); and a horizontal through hole is formed between the main block and a block (vertically adjacent to the main block) by virtue of opposite openings of U-shaped grooves on the short longitudinal ribs. According to the invention, the relatively complex construction operation of traditional blocks bonded by using mortars is simplified, and the working efficiency, anti-permeability performance and leakage resistance of the block are improved, meanwhile, the
noise and dust of an operation field also can be reduced, and energies and raw materials can be saved, thereby satisfying the green and environmentally-friendly requirements of
building construction and facilitating the implementation of housing industrialization.