The invention discloses an LED driving power supply without an electrolytic capacitor, belonging to the field of LED driving power supply. The LED driving power supply comprises a commercial power rectification circuit, a PFC circuit, a DC/DC circuit, a bidirectional converter, a ceramic capacitor, and a digital control circuit, wherein after a commercial power signal is subjected to rectification by the commercial power rectification circuit, the signal is inputted into the PFC circuit. The PFC circuit accesses the ceramic capacitor. The DC/DC circuit and the bidirectional converter are in parallel connection with the ceramic capacitor respectively. The DC/DC circuit accesses the LED load. The LED load outputs a current sampling signal to the digital control circuit. The digital control circuit controls the PFC circuit, the DC/DC circuit and the bidirectional converter respectively. According to the driving power supply, the ceramic capacitor is used to replace the electrolytic capacitor, and the power supply has the advantages of a long service life, small volume, good ripple performance and good PFC performance.