The invention provides an 
OLED (Organic Light-Emitting 
Diode) display panel and a manufacturing method thereof. The 
OLED display panel comprises an 
anode electrode layer formed on a planarization layer, a pixel limitation layer formed on the planarization layer and located on the periphery of each sub-pixel, an isolated cylinder layer formed on the pixel limitation layer, an 
OLED public layer formed on the isolated cylinder layer, a 
cathode auxiliary layer formed on the OLED public layer and a 
cathode electrode layer formed on the OLED public layer and electrically connected to the 
cathode auxiliary layer. The 
anode electrode layer comprises a plurality of 
anode electrodes mutually isolated; each anode electrode corresponds to a sub-pixel. The isolated cylinder layer comprises a plurality of isolated cylinders mutually isolated, and the isolated cylinders are formed on the upper surface of the pixel limitation layer and located between adjacent sub-pixels; at least two isolated cylinders are arranged between adjacent sub-pixels, and a groove is formed between adjacent isolated cylinders. The cathode auxiliary layer comprises a plurality of auxiliary 
bus bars which are embedded into the OLED public layer, and respectively correspond to grooves arranged between adjacent isolated cylinders.