Compared with traditional gas-compression/expansion refrigeration, magnetic refrigeration based onmagnetocaloric effect (MCE) exhibits the advantages of high energy efficiency and environmentfriendliness. Here, we created a giant MCE in ErMnO3 frustrated magnetic single crystal by themagnetization vector rotation of single crystal with strong magnetocrystalline anisotropy(MCA), ratherthan merely via the order-disorder magnetic phase transition.