The utility model relates to a submarine pipeline bend-preventing device and a manufacturing and installation method thereof. The submarine pipeline bend-preventing device comprises two ring-shaped thick wall casing bodies. Both sides of the two casing bodies respectively and symmetrically extend out a strip-shaped eye plate, and the two casing bodies are connected into a whole through bolts. A concrete press block with a horseshoe-shaped section is poured on the outer part of the casing bodies in each eye plate at both sides, two vertical anchor plates and two inclined anchor plates are symmetrically welded at both sides of the lower casing body along the length direction of concrete, and the upper part of each anchor plate is poured in the concrete press block. The submarine pipeline bend-preventing device can be applied to a submarine pipeline placed in sea bottom in a bare mode, greatly reduces the cost of pipeline trenching and burying, effectively controls the buckling spread of the submarine pipeline, strengthens the stability in place and realizes the unity of economy and security.