The invention discloses a high-energy electromechanical transition material, which adopts tetravalent stannum element to partially replace tetravalent zirconium element in lead zirconate titanate compound Pb(Zr, Ti)O3, adopts quinquevalent niobium element or tervalent lanthanum to partially replace bivalent lead element in Pb(Zr, Ti)O3, and simultaneously adds slight chromium or iron element to form a multi-composition solid solution. The chemical constitution formula of the high-energy electromechanical transition material is written into (Pb, C, D)[(Zr1-ySny)1-xTix]O3, wherein C represents the quinquevalent niobium element or the tervalent lanthanum, and D represents tervalent iron element or chromium element. The material has the characteristics of small applied pressure and great released electrical energy, and can be used as a constant-current power supply source and a high-voltage pulse power source.