Deep treatment of wastewater containing low concentration rare earth elements (REEs) is significant for environmental remedy and full utilization of resources. Effective extraction of such system at a high phase ratio remains challenging. A new strategy is proposed to perform the highly efficient extraction by using the paramagnetic Janus particle (PJP) as the functional solid surfactant. A larger interface area is provided by forming the emulsion in the presence of PJP, facilitating a faster mass transfer. The ion contained extractant emulsion droplets stabilized with the PJP can be easily collected from the aqueous phase with a magnet. Taking neodymium (Nd3+) contained aqueous solution (100 ppm) as the model of low concentration wastewater, a high extraction efficiency over 99% can be achieved within a short time. The PJP can be easily isolated from the extractant by using a stronger magnet, which can preserve the same capability as the original one.