The invention provides a method for preparing lithium ferrite thermal spraying powder used for conductive coating. The method includes the following steps: (1) mixing the materials and jolt-ramming; (2) pelletizing and drying; (3) calcinating and crushing; (4) agglomerating; (5) carrying out spray granulation; (6) carrying out heat treatment. The lithium ferrite thermal spraying powder prepared by using the method provided by the invention is high in crystallinity, good in sphericity retaining capability and fluidity; the lithium ferrite coating prepared by using the thermal spraying powder is good in conductivity, bonding strength and corrosion resistance; the process and device of the invention are simple and controllable, convenient to operate, low in cost, short in production period, and good in repeatability; the powder yield is as high as 75% or above; demands for scale production of thermal spraying powder used for Li0.5Fe2.5O4-x conductive coating are met.