The invention discloses an aluminum alloy extrusion board with an adjustable hook face internal angle. The aluminum alloy extrusion board is characterized by comprising a face board and wing boards; the number of the wing boards is at least three, the face board and the wing boards are all long-strip-shaped boards, the longitudinal direction of the wing boards is coincident with the longitudinal direction of the face board, the width direction of the wing boards is perpendicular to the back face of the face board, the wing boards are distributed on and connected to the back face of the face board at equal intervals from the edge of one side to the edge of the other side in the width direction of the back face of the face board, symmetrically-distributed reverse teeth are arranged on the two opposite lateral faces, far away from the outer half section of the face board, of the adjacent wing boards, the opposite reverse teeth between the adjacent wing boards get close step by step from outside to inside, and a longitudinal groove is formed in the longitudinal center line portion, between every two adjacent wing boards, of the back face of the face board; and expansion blocks are arranged between the opposite reverse teeth between the adjacent wing boards, buckles capable of being buckled on barbs on the same sides are arranged on the two sides of the expansion blocks respectively, and guiding limiting plates capable of being inserted into the longitudinal grooves are arranged in the middles of the expansion blocks. The required extrusion pressure is small, and the hook face internal angles with different change curvatures can be obtained through adjustment.