The utility model discloses an experimental apparatus is leached in rainwater leaching, it installs rainwater splendid attire ware, soil splendid attire ware and the extract collector on experiment bench to correspond in proper order including experiment bench and top -down, connect gradually flowmeter, rainwater leaching head through the pipeline between rainwater splendid attire ware and the soil splendid attire ware, the top at soil splendid attire ware is arranged to rainwater leaching head, soil splendid attire ware spills the soil splendid attire ware of function including the area, and just the two can freely not alternate with not taking the soil splendid attire ware that spills the function, the bottom that the area spilt the soil splendid attire ware of function is equipped with a plurality of holes of leaching, compared with the prior art, the utility model discloses had rainwater leaching device simultaneously concurrently and surveyed the sample and leach the device to the leaching head can go on changing and simulates multiple raininess along with the experiment demand, has improved the stability and the accuracy of monitoring data under the different raininess conditions greatly.