The invention provides an embedded browser CSS (Cascading Style Sheets) based engine parallelization method, which comprises the following steps: 101) starting a main thread to carry out page parsing; 102) establishing a new thread to download external style sheets or picture resources received in a current page parsing process; 103) establishing another new thread, and parsing a received CSS style by the new thread, finishing the page parsing by the main thread after a period of time, and finishing style parsing by other new threads, wherein one CSS style is parsed by one new thread; 104) starting a selector matching thread, inputting the output results of the page parsing and the style parsing into the selector matching thread to finish the matching of DOM (Document Object Model) nodes and a selector, and finally generating a rendering tree. The method independently carries out parallel processing on three aspects including CSS engine resource acquisition, style parsing and selection matching so as to shorten latency time in the page parsing process of a browser and quicken a webpage loading speed.