In this report, the trace amount of some rare earth impurities in meat and some organs sample from pig feeded with rare earth food additive was determined by inductively coupled plasma mass spectrometry (ICP-MS). The signal suppression effect of the sample matrix on the signals of the REE was effectively compensated for using 103Rh internal standard. The grounded samples were subjected to microwave acid digestion as reported by TCVN-9525:2018. Briefly, 0.5 g of the sample was mixed to 2.0 mL of 65% HNO3 and 1.0 mL of 30% H2O2 in microwave polytetrafluoroethylene digestion vessels. The microwave digestion system was operated at 400W (medium power mode) for 12 min. The method of detection limits (LOD) were in the range of 0.004 µg/kg to 0.018 µg/kg. The sample recovery was obtained between 97.0and 107.3 % by the certified reference material (CRM-BCR-668). La, Ce, Pr, Nd, and total REEs contentwere assessed. The La, Ce content in some pig organs samples (liver, heart, spleen, kidney) using rare earth food additive were higher than the reference samples about two to three times, and in the meat sample were negligible.