The invention discloses a fusion electro-spinning jet flow excitation stability improving device. The improving device comprises a feeding needle cylinder for discharging fusion materials according to the preset feed amount, a jet flow needle head which is used for attracting the fusion materials discharged by the jet flow needle head and enabling the fusion materials to be condensed into a Taylor cone, and a printing plate which is arranged below the jet flow needle head and moves in a horizontal plane according to a preset path; the bottom of the printing plate is provided with a polar plate; the jet flow needle head has polarity, and the polarity of the polar plate is opposite to that of the jet flow needle head; and the printing plate is connected with the ground. In this way, as the fusion materials are fused in the feeding needle cylinder and discharged at first and then are attracted and condensed through the jet flow needle head, finally polarity is given to the fusion materials, and directional jet is conducted; thus, the process that the fusion materials are heated inside the jet flow needle heat in an electric heating mode is omitted, electric charge disturbance of the fusion materials at the tail end of the jet flow needle head is eliminated, and the diameter tends to be stable after jet flow is excited; and accordingly, the whipping phenomenon in the jet flow excitation process is weakened, and the accuracy degree of a jet flow drop point and the printing precision of a biological scaffold are improved.