The invention discloses a glass fiber impregnating agent of a yarn for mechanical arm jetting, and belongs to the technical field of a glass fiber impregnating agent. The glass fiber impregnating agent of the yarn for mechanical arm jetting is prepared from a double-component coupling agent, a double-component film-forming agent, a double-component lubricating agent, an anti-static agent, a pH value regulator and deionized water. The yarn for jetting produced by the glass fiber impregnating agent can be applied to mechanical arm jetting, has high choppability, excellent smooth performance, high dispersibility and high penetration speed, realizes static accumulation, has high binding ability with matrix resin and has stable quality.