The invention relates to a natural compound microbial agent and a method for producing Pixian-county chili bean sauce. The natural compound microbial agent is prepared in the mode that broad-bean-starter-made sweet bean filter liquor is inoculated into a culture medium. The culture medium is prepared from wheat flour, starter-bean powder, glucose, sodium chloride, rapeseed oil and drinking water in proportion at high temperature according to steps, and the sweet bean filter liquor is inoculated after the culturing medium is cooled. The method for producing the Pixian-county chili bean sauce includes the steps that the natural compound microbial agent and salt water are prepared into inoculation salt water, starter beans and the inoculation salt water are mixed to be fermented into sweet beans, fermented chili particles and the sweet beans are put into a tank and blended, overturning, sunning and exposing are carried out for 1.5-36 months, and the Pixian-county chili bean sauce is obtained. The natural compound microbial agent and the method completely conform to the production technology and the production concept of traditional Pixian-county chili bean sauce, the ratio of the adopted natural compound microbial agent is complex and diverse, the produced Pixian-county chili bean sauce is good in flavor, and agent propagation expanding is low in cost, convenient and short in period. The production fermentation period of the sweet beans can be shortened to 25 days, and fermentation efficiency is greatly improved.