The utility model discloses a convenient fixed sit up auxiliary equipment, including the bedplate, one side fixedly connected with branch of bedplate, the one end fixedly connected with sill bar of branch, the equal fixed mounting in both sides of bedplate has the gim peg, fixedly connected with connecting rod between the gim peg, the joint has the stop collar on the connecting rod, first fixed band of fixedly connected with and second fixed band respectively on the stop collar of bedplate both sides. The utility model discloses a set up the gim peg, the female subsides is pasted to the magic, dead lever and elastic cord, the tie of person taking exercise's shank is lain on the bedplate, stimulate first fixed band and second fixed band on the connecting rod at first respectively, then paste the magic subsides mother on public subsides of the subsides of the magic on the first fixed band and the second fixed band to paste and be in the same place, thereby it is fixed with person taking exercise's foot, then it is fixed with person taking exercise's shank through the elastic cord, thereby convenient fixed mesh of taking exercise has been reached, prevent person taking exercise's when taking exercise shank tilting, thereby person taking exercise's training effect nature has been strengthened.