The invention discloses an engine oil seal lip grease charging device. The bottom part of an upright column is fixed on a bottom seat, a supporting beam is equipped at the upper part of the upright column, and an oil cylinder is fixed at the beam end of the supporting beam; the axle center lines of the oil cylinder and the upright column are parallel, a push rod is arranged in the inner cavity of the oil cylinder, the upper end of the push rod is stretched out the upper end opening of the oil cylinder, a piston is equipped at the lower end of the push rod, and the piston can longitudinally slide in the inner cavity of the oil cylinder; a positioning sleeve is fixed at the bottom end of the oil cylinder, the positioning sleeve with an open mouthed upper end and a sealed lower end is in a cylindrical structure, the inner cavity of the positioning sleeve is communicated with the inner cavity of the oil cylinder, a guiding hole is arranged on the peripheric surface at the lower end of the positioning sleeve, and the guiding hole is communicated with the inner cavity of the positioning sleeve. The invention has good security, and is easy to operate, the grease charging speed is high, the labor intensity of the workers is low, and the operating efficiency is high; the invention can uniformly coat the grease on the oil seal lip, the phenomenon that the grease overflows can not occur, and the erroneous indication of grease leaking is effectively eliminated.