Flow velocity measuring instrument

The utility model relates to a flow velocity measuring instrument and belongs to the technical field of water conservancy detection. The diameter of the front-end cylinder is greater than that of therear-end cylinder; a plurality of tail wings of a trapezoidal structure are arranged at the tail of the rear end cylinder, a first pressure sensor and a temperature sensor are arranged in the left side sensor detection opening, a first pressure sensor and a temperature sensor are arranged in the middle sensor detection opening, and a second pressure sensor is arranged in the right side sensor detection opening. The patent has the beneficial effects that the detector detects pressure and temperature data and transmits the pressure and temperature data to the data collector through the data line, the detection shells with different diameters are arranged, the water flow speed can be manually changed, and the front-back through cavity can effectively prevent obstacles such as weeds from blocking the detector; a plura