The utility model belongs to the technical field of the oil research equipment, concretely relates to experimental device for test influences water injection well water injection rate. Getting one's things ready including water tank, outlet pipe, high pressure water pump, wet return and reducer pipe and putting, the outlet pipe passes through the flange to be connected with the U type combination return trap that the two is established ties, the water tank in be equipped with temperature sensor and electrical heating rod, when using the device experiment, can come control through the switch ball valve and use the quantity of U type combination return trap to this loss of pressure and water injection well bottom pressure who comes to simulate respectively ground water injection pipeline gets one's things ready the ball valve put by the switch reducer pipe and can select the pipeline experiment of different internal diameters, is used for simulating the situation of change of ground water injection pipeline and water injection well riser water injection rate under the circumstances of scale deposit thickness difference, the utility model has the advantages of simple structure, reasonable in design, safe and reliable, easy and simple to handle, the test is accurate, low cost, easily on a large scale popularization and use.