Taking Wangcang County of Sichuan Province as an example, this paper made comprehensive benefit analysis on models of circular agriculture in Wangcang County. Major models include “pig – biogas – fruit”, “pig – biogas – vegetable”, and “pig – biogas - tea”. It made cost benefit analysis of economic, social and ecological benefits. Through benefit analysis charts, it obtained that the net present value of each household building biogas pool is 6029 yuan. In this way, it significantly improved ecological environment and social benefits, and the agricultural economic development model gradually changes to sustainable development model. However, there are still problems of insufficient government input and single model of agricultural circular economy. Therefore, government should increase input and develop diversified agricultural circular economical models in accordance with local situations, to realize sustainable agricultural development.