Low B rare earth magnet

The present invention discloses a low-B rare earth magnet. The rare earth magnet contains a main phase of R 2 T 14 B and comprises the following raw material components : 13.5 at%ˆ¼4.5 at% of R, 5.2 at%ˆ¼5.8 at% of B, 0.3 at%ˆ¼0.8 at% of Cu, 0.3 at%ˆ¼3 at% of Co, and the balance being T and inevitable impurities, the R being at least one rare earth element comprising Nd, and the T being an element mainly comprising Fe. 0.3ˆ¼0.8 at% of Cu and an appropriate amount of Co are co-added into the rare earth magnet , so that three Cu-rich phasesormed in the grain boundary, and the magnetic effect of the three Cu-rich phases existing in the grain boundary and the solution of the problem of insufficient B in the grain boundary can obviously improve the squareness and heat-resistance of the magnet.