An oily system preparation method of a lithium battery positive electrode plate comprises the raw materials: an aluminum foil, N-methyl pyrrolidone, a positive electrode material, conductive carbon black and polyvinylidene fluoride; the lithium battery positive electrode plate is prepared and formed by the following steps of mixing, feeding, coating, drying, tabletting, and cutting. The prepared positive electrode plate has the advantages of large discharge capacity and good cycle performance. The method is simple in process and easy to operate; the stable-quality lithium battery positive electrode plate is easily obtained; a battery formed by the positive electrode plate is high in qualified rate and has good use effect.