The invention discloses a device for inducing orientation arrangement of montmorillonoid in polyethylene by using an electric field. The device comprises an upper electrode and a lower electrode, wherein the upper electrode and the lower electrode are oppositely arranged, a uniform electric field space is formed between the upper electrode and the lower electrode after electrified, the uniform electric field space is internally used for placing a sample container, and a high-voltage access end and a ground terminal are respectively arranged on the upper electrode and the lower electrode. Based on the inducing orientation device, the invention also provides a system and a method. A power frequency alternating current power supply ensures that the montmorillonoid in a low polyethylene/montmorillonoid composite material under a molten state is in orientation arrangement along the direction parallel to the electric field. For an electrical tree growing vertical to the direction vertical to the induction electrical field, the method has the advantages of capabilities of increasing initiation starting voltage of the electrical tree, reducing initiation rate of the electrical tree, delaying the growth speed of the electrical tree, and reducing the growth length of the electrical tree, simple process, lower cost, and economy.