The invention discloses a dynamic laying device for testing the flow conductivity of a propping agent under the simulated formation condition. The dynamic laying device mainly comprises a nitrogen cylinder, a stirring device, a flow conducting chamber and a waste collecting device. The nitrogen cylinder is connected with the stirring device comprising a stirring chamber body and a seal cover, an auxiliary material inlet is formed in the seal cover, a temperature-controllable heating insulation cover is arranged outside the stirring chamber body, and a discharging port is formed in the lower portion of the temperature-controllable heating insulation cover. The flow conducting chamber is located in a temperature-adjustable incubator, connected with the discharging port of the stirring device through an inlet flow stabilizing tube, and connected with the waste collecting device through an outlet flow stabilizing pipe. The flow conducting chamber is formed by a flow conducting chamber body, an upper piston, a lower piston, a rock wool board and an inlet and outlet joint. By means of the dynamic laying device, the dynamic process that mixed liquid of crosslink fracturing fluid and the propping agent enters formation along a shaft and is heated gradually in the pumping process can be simulated, the mixed liquid is pumped into the flow conducting chamber with a certain velocity, and dynamic sand laying is achieved. The process of dynamic gel breaking process of the crosslink fracturing fluid can be simulated after sand laying, and conditions are provided for testing the flow conductivity under the simulated formation condition.