The invention relates to the technical field of feed strain fermentation tanks, and discloses a feed strain fermentation tank with balancing and stirring devices. The feed strain fermentation tank comprises a support frame, wherein a tank body is fixedly connected inside the support frame, a tank cover is lapped to the top of the tank body, a mounting base is fixedly connected to the top of the tank cover, fastening mechanisms are fixedly connected to two sides of the top of the tank cover, a drive mechanism is fixedly connected to the top of the mounting base, a stirring mechanism is fixedlyconnected to the output end of the drive mechanism, and the bottom of the stirring mechanism penetrates through the tank cover and extends to the inside the tank body. For the feed strain fermentationtank with the balancing and stirring devices, pull rings are pulled towards the outside, so that a pull rod and a movable plate are moved towards the outside, then a positioning rod is separated fromthe inside of a positioning hole, a balancing weight is conveniently taken down, a balancing mechanism is then conveniently removed from the fermentation tank, the balancing mechanism is convenientlyrepaired, and the problem that most of the existing balancing weights are welded to the balancing mechanism, and the balancing weights are heavy, so that people can not conveniently detach the balancing mechanism, is solved.