The invention discloses a method for replacing a material taking machine jackstay and the material taking machine jackstay for the method. The method includes the following detailed steps that step1, supports are installed; step2, a balance weight pull rod is detached; step3, a big arm pull rod is detached; step4, the material taking machine jackstay is detached; step5, a new material taking machine jackstay is installed; step6, the big arm pull rod is installed; step7, the balance weight pull rod is installed; step8, the supports are detached. The material taking machine jackstay comprises two girders, an upper beam and a lower beam. The upper beam is fixed to the tops of the two girders, the lower beam is fixed to the bottoms of the two girders, and reinforcement beams are further arranged at equal intervals between the two girders. Cover plates are arranged at the tops of the upper beam and the lower beam, and water leakage holes are formed in the reinforcement beams. Hinged point lug plates are welded to the tops of the two girders. The replacing problem of a traditional material taking machine jackstay can be effectively solved, and the material taking machine jackstay has the advantages of being reasonable in stress, not prone to being corroded and easy to construct.