The invention discloses a method for manufacturing micro parts by sintering under electric field action. The method comprises the following steps of: firstly loading metal powder with the grain diameter of 500 nm to 70 microns into a mold; then directly electrifying to heat the metal powder at the heating speed of 5-900 DEG C/s and at the vacuum degree higher than or equal to 10<-2> Pa; meanwhile, exerting an acting force of 4-100 MPa at two ends of the mold, heating to the temperature of 600-900 DEG C under the durative action of an electric field and carrying out heat-insulating for 2-3 minutes so as to enable the metal powder to form in the mold; and finally, powering off, air-cooling and taking out the micro parts. As the heating speed in the method disclosed by the invention is greatly enhanced, the diffusion among atoms is accelerated, and the metal powder can be easier to be in a molten state; and in addition, the pressure is exerted at the two ends of the mold, the green compact forming and the compactness sintering are simultaneously carried out, and the growth for crystal grains is further inhibited, so that superfine crystal grain structures can be obtained, and the performance of miniaturized parts is ensured.