The invention relates to a pump, in particular to an impeller used for the corrosion-resistant chemical process pump and applied in the fields the chemical engineering, the petroleum, the pharmacy, the acid cleaning, etc. The impeller is made from the ultra high molecular weight fluorinated ethylene propylene by die pressing under the pressure of 8 to 12 MPa after being sintered under the temperature of 370 to 390 DEG C, and a metal bracket is arranged inside the impeller. The impeller has the advantages that a corrosion-resistant and anti-leak shaft sleeve and the rear part of the impeller are formed into a connecting body, not only the shaft sleeve originally arranged is replaced, but also the seal leakage point is reduced; the appearance is beautiful, the installation is quick and convenient, the corrosion-resistant and temperature-resistant performances are long, the impeller is never aged, the high maintenance frequency and the high maintenance cost due to the vulnerable shaft sleeve is reduced, and the problem of reduction of the service life of the pump due to the corrosivity of the chemical mediator of the user is fundamentally solved.