The invention discloses a PLD (pulse laser deposition) device which comprises a deposition cavity, a target arranged in the deposition cavity and a substrate seat, wherein the substrate seat and the target are oppositely arranged; an optical window slantly opposite to the target is arranged on a body of the deposition cavity and used for pulse laser incoming so as to bombard the target; plasma gas is generated after the target is ablated and reaches the substrate surface on the substrate seat to generate a target thin film under the actions; and the target is disc-shaped and comprises fan-shaped bodies made of a plurality of different materials. The target is a multi-element target made of a plurality of unit materials, so that pulse laser beams irradiate on the surface of each unit target periodically when the target rotates around a center shaft, plasma gas generated by each unit target performs self-assembly on the substrate, and a required target thin film material is formed, and further, the thin film at any proportion can be obtained by adjusting an area ratio of different materials in the multi-element target.