Recombinant Anti-CD89 x Anti-EGFR Bispecific Antibody (Fab-Fv) is designed to be expressed as two polypeptide chains. The heavy chain Fd fragment and light chain of an anti-CD89 antibody are fused with the VL and VH domains of an anti-EGFR antibody respectively. It can form natural in vivo heterodimerization. This BsAb can retarget macrophages to tumor cells. It is designed for the research of Head and neck cancer; Colorectal cancer (CRC); Glioblastoma multiforme (GBM); Squamous cancer; Non-small cell lung cancer (NSCLC); Solid tumors therapy.