The invention belongs to the poultry feeding field and particularly relates to a feed trough swinging mechanism in a poultry feeding device. The mechanism includes a support bottom plate, wherein thesupport bottom plate is provided with a positioning bottom plate, the positioning bottom plate is a trapezoid structure, one side of the positioning bottom plate is fixedly connected with the surfaceof the support bottom plate, one side of the positioning bottom plate away from the support bottom plate is movably provided with a moving plate, the positioning bottom plate is provided with two setsof sliding grooves, the sliding grooves are arranged below the moving plate, one side of the moving plate close to the positioning bottom plate is perpendicularly connected with support columns, thesupport columns movably penetrate through the sliding grooves and extend to the positioning bottom plate, the two sets of support columns in the positioning bottom plate are connected through supportplates, and the support plates are parallelly arranged at the middle in the positioning bottom plate. The mechanism is advantaged in that stability of swinging of the feed trough is improved, the feeding function is achieved, compared with a moving board end, the sliding grooves can be hidden at the bottom of the moving plate.