Constant water head detection device for detecting water flow standard

The invention discloses a constant water head detection device for detecting a water flow standard, and particularly relates to the technical field of water flow standard detection.The constant water head detection device is provided with a detection mechanism, the detection mechanism comprises an inclination sensor, a liquid level meter and an air cylinder, and whether the liquid level meter is perpendicular to the water surface in a connecting pipe or not is monitored through the inclination sensor; if the liquid level meter inclines and is not perpendicular to the water surface in the connecting pipe any more, the air cylinder is started to stretch out and draw back to drive the liquid level meter to rotate, so that the liquid level meter is always perpendicular to the water surface in the pipeline, and measured data are accurate; according to the method, the distance deviation coefficient and the performance coefficient are collected and processed to generate the evaluation coefficient, the evaluation coe