Nanobody targeting bcma and application thereof

A nanobody, comprising a heavy chain variable region containing CDR1, CDR2 and/or CDR3, and has the function of recognizing and binding to BCMA, and wherein:

• the CDR1 is selected from the following group:
• (1) as shown by the amino acid sequence of SEQ ID NO:
• 4, or having substitution, deletion or addition of 1-3 amino acid residues in the amino acid sequence shown by SEQ ID NO:
• 4;
• (2) as shown by the amino acid sequence of SEQ ID NO:
• 6, or having substitution, deletion or addition of 1-3 amino acid residues in the amino acid sequence shown by SEQ ID NO:
• 6;
• the CDR2 is shown by the amino acid sequence of SEQ ID NO:
• 23, or has substitution, deletion or addition of 1-3 amino acid residues in the amino acid sequence shown by SEQ ID NO:
• 23;
• the CDR3 is selected from the amino acid sequences shown by SEQ ID NOs:
• 27-52.