Developing closed-loop magnets that operate in persistent current mode (PCM) is crucial for achieving higher resolution and sensitivity in NMR and MRI devices. Here, we report the world’s first closed-loop multi-pancake (MP) HTS magnet operated in PCM based on a novel jointless winding method and superconducting joint of REBCO coated conductors (CCs), to the best of our knowledge. The in-field characteristics of the CC and the joint are investigated to determine the operating parameters of the magnet. The central field of the magnet reaches ~0.4 T at 77 K, with a drift rate of ~1.1Í10-3 ppm/h, inferring that the joint resistance can be less than 3.1Í10-14 Ω. Furthermore, although the _I_cvalue of the joint is considerably lower than that of the CC at self-field, it can maintain similar comparable or even higher in-field _I_ccompared to the CC, which is immensely beneficial for magnet applications. This study provides valuable insights into the design and construction of the closed-loop MP magnets operating in PCM.