Permeable pavement brick

The invention discloses a permeable pavement brick. The permeable pavement brick comprises a square portion and four projections, wherein the four projections are positioned on the side wall of a peripheral side of the square portion; the square portion and the projections are formed integrally; each projection is in the shape of a right trapezoid; a right-angled surface of one side of each projection is connected with a side wall of the square portion; the height of the right-angled surface of one side of each projection is the same with that of the square portion; rectangular grooves are respectively formed in outer sides of the four projections; and the projections positioned on two sides of each rectangular groove are respectively provided with two projections and two grooves which are adjacent to each other. The two adjacent permeable pavement bricks are matched with each other by the projections and the corresponding grooves on the projections of the two adjacent permeable pavement bricks, a V-shaped groove is formed between corresponding inclined planes, a gap I is formed between the corresponding rectangular grooves, a gap II is formed between four corresponding corners of four adjacent permeable pavement bricks, and stable interlocking of the bricks is guaranteed. The permeable pavement brick has the advantages of high water permeation speed, large water permeation amount, good water permeation effect, stable structure, difficulty in looseness and the like.