The invention relates to a dish solar concentrator reflecting surface module mounting structure. The reflecting surface assembly comprises a reflecting surface module (1), and a first mounting seat (2), a second mounting seat (3) and at least a third mounting seat (4) fixing the reflecting surface module (1) on a reflecting surface supporting net rack. The mounting seat at least comprises a supporting seat; the front end of each supporting seat is provided with a mechanism which can translate and rotate along three directions: a direction along the axis and two directions vertical to the axis; each mounting seat is thus provided with a mechanism with six degrees of freedom capable of being adjusted before being fastened; the reflecting surface module (1) can be ensured to be adjusted in each direction according to needs when mounted on the net rack; the reflecting surface module can conveniently splice a whole reflecting surface meeting precision requirements, the manufacturing precision of the reflecting surface module supporting net frame can be reduced; and the purpose of reducing the manufacturing cost can be achieved.