An electro-hydraulic variable valve lift apparatus includes a housing, a driving cam, a pump piston which forms a main chamber with the housing, reciprocates within the housing according to rotation of the driving cam, and forms hydraulic pressure within the main chamber, a pump piston elastic portion disposed for elastically supporting the pump piston, an oil pressure controller communicating with the main chamber in order to control hydraulic pressure within the main chamber, a hydraulic piston slidably disposed within the housing, includes a first body having a first diameter and a second body having a second diameter larger than the first diameter, and is connected with a valve, and a piston guide disposed between the housing and the hydraulic piston for guiding the hydraulic piston.