The utility model discloses a support used in pipeline fluid velocity measurement. The support comprises a tripodal supporting leg. The tripodal supporting leg comprises a connection disk, two fixation rods which are fixedly connected with the connection disk, and an adjustment rod which is movably connected with the connection disk, wherein the two fixation rods form a certain included angle. Both of the connection disk and a locating observation disk are provided with observation holes. The included angle between the adjustment rod and the plane formed by the centre lines of the two fixation rods is beta 2, wherein the included angle beta 2 is adjustable. The movably connection means that the adjustment rod and the connection disk are connected through a ball joint bearing. According to the utility model, two fixation rods and one adjustment rod are arranged, the included angle between the adjustment rod and the plane formed by the two fixation rods is beta 2, so during utilization, adjustment can be performed conveniently. The locating observation disk is arranged under the connection disk, so during utilization, the measurement directivity can be determined and controlled conveniently so as to make a pitot tube be measured in a precomputed direction, so that large errors caused by hard predetermined direction control and easily-occurred pitot tube shaking during manual operation can be avoided.