The invention discloses an L-type Pitot tube fixing positioning device. The device comprises the following steps of an L-type Pitot tube, a fixing rack, a slide block and a fixing block, wherein the L-type Pitot tube includes a Pitot tube anode, a Pitot tube cathode, a measuring rod and a probe; the fixing rack includes a fixing end and a guide rail, the fixing end includes a fixing rack side hole through which the probe of the L-type Pitot tube passes, and the guide rail is provided with a guiding groove; the slide block is connected to the L-type Pitot tube to drive the L-type Pitot tube to move on the guide rail; and the L-type Pitot tube is fixedly arranged on the slide block through the fixing block. By using the L-type Pitot tube fixing positioning device, in a cooling tower resistance characteristic model test, the L-type Pitot tube is well fixed, and the probe of the Pitot tube can be rapidly, conveniently and accurately moved to a measuring point apparatus.