Experiment device for accurately measuring relatively large evaporation from water surface under solar irradiation

The invention discloses an experiment device for accurately measuring relatively large evaporation from a water surface under solar irradiation. The experiment device mainly comprises four parts, namely an evaporation measurement system, a radiation measurement system, an air parameter measurement system and a temperature measurement system. The connected four measurement systems are firstly put on an outdoor flat ground when the experiment device is utilized to measure, so that no relatively high and relatively large building within 100m is ensured; enough water is injected into the evaporation measurement system; and an experiment is carried out after the systems are connected. According to the device, the defect of inaccurate measurement caused by liquid accumulated in a siphon in the water surface evaporation process is overcome; heat loss between a water body and the sun, and between air and ambient environment is basically eliminated; heat transfer along the axial direction of a pond when the water body is evaporated is achieved; the purpose of not destroying a boundary layer by adjusting the height of a sun shield according to different air speeds is achieved; meanwhile, the evaporation from the water surface is measured by a communicating vessel weight measuring method and a liquid level difference method; and the measurement is accurate and reliable.