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In view of the problems that the existing closed breeding pig performance measurement station is less researched at home and abroad, the degree of automation is not high, and the body size information of breeding pigs cannot be provided. The enclosed breeding pig performance measurement system was designed, which integrated automatic breeding pig identification, automatic weight weighing, automatic feed intake statistics and automatic body size measurement. The front and back end separation design was adopted in the mechanical part of the system. Feeding device and access controlling device were designed to provide a closed measurement environment for breeding pigs. On this basis, the dynamic weighing algorithm of breeding pigs was designed based on FIR filter, the ideal pose selection algorithm of breeding pigs was designed based on ellipse fitting, and the size measurement algorithm of breeding pigs based on envelope analysis was further proposed. The growth performance and body size of simulated breeding pigs were measured respectively. The experiment verification results were as follows: the daily feeding times of pigs were 8.94, the daily feeding time was 92.93min, the feed to meat ratio of pigs was 2.66, the inflection age of growth curve was 126.18d, and the inflection weight was 72.70kg, which were in line with the growth law of pigs in the growth performance experiment. Ideal pose frames were selected for body size measurement experiment pigs. The average relative detection errors of body length, body width, hip width, body height and hip height were 3.69%, 2.53%, 2.60%, 2.59% and 2.17%, respectively, meeting the requirements of body size measurement. The results showed that the closed breeding station designed could be used to measure the production performance of breeding pigs, and the information of weight, feeding and body size of breeding pigs at the same time could be provided to improve the breeding efficiency and promote the development of domestic production of breeding pigs.