Recombinant Anti-CD89 x Anti-EGFR Bispecific Antibody (Fab-scFv-Fc) requires expression of three polypeptide chains, encoding two heavy chains (Fc-containing chains) and one light chain, respectively. The Fab of anti-CD89 antibody variable domain is fused to the Fc-knob domain with a hinge region and the same as the scFv of anti-EGFR to the Fc-hole domain, or vice versa. The Fab-Fc and scFv-Fc fragments can be paired via the interaction of the Fc regions. 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.