The invention discloses a reinforcement protective cover cushion block fixing method, which comprises the following steps of: (1) preparing a plurality of cushion blocks with same structures, wherein each cushion block is a hexahedron, upper and lower surfaces and one side wall surface I of each cushion block are planes, a steel tank is embedded on one side of each cushion block close to the side wall surface I, and the other three side wall surfaces of each cushion block are arc surfaces; (2) using adaptive thin steel strips to penetrate through the steel tanks; connecting the cushion blocks in series to form a cushion block string; and pressing and bending steel strips on two sides of each steel tank; and (3) if a reinforcement framework is to be prefabricated, prefixing the cushion block string on a bound reinforcement framework by a steel strip; and then lifting the reinforcement framework into a template. According to the invention, the thickness of a reinforcement protective cover can be guaranteed; as the field bulk binding of the cushion blocks is changed into centralized prebinding, the field operation time can be greatly reduced, obvious technical and economic benefits are obtained, the fixing method is beneficial for accelerating construction progress and project investment is saved. The reinforcement protective cover cushion block fixing method disclosed by the invention is especially suitable for object side surfaces or bottom surfaces with small reinforcement distances and difficulties in binding the cushion blocks.