The utility model discloses a clamp for a petroleum pipeline. The clamp comprises a movable support body, a first fixing board, a second fixing board, a third fixing board, a fixing assembly and jacking assemblies, wherein the first fixing board, the second fixing board and the third fixing board are arranged on the movable support body side by side, the fixing assembly is perpendicularly arranged on the first fixing board in a sliding mode, the fixing assembly comprises a U-shaped sliding block and an adjusting clamping piece arranged on the sliding block, wherein the structures of the upper end and the lower end of the adjusting clamping piece are identical, the adjusting clamping piece comprises a rotary rod and a first baffle tightly attached to the end of the rotary rod, a compression spring is arranged in a groove formed by the first baffle and a second baffle, the second baffle is connected with a detachable clamping board, and the jacking assemblies are symmetrically arranged on the second fixing board and the third fixing board. After the petroleum pipeline is placed on the clamp, acting force is exerted on the petroleum pipeline in the horizontal direction and the perpendicular direction, and therefore the petroleum pipeline is firmly fixed to the clamp.