The invention discloses a multipurpose exercise fitness device in schools comprising a fitness device body; a parallel bar support is installed on the fitness device body; a support column is installed on the parallel bar support; one end of the support column is provided with a handle; one side of the handle is provided with a bearing; one side of the bearing is provided with a muscle training handle; a support panel is installed at the bottom end of the parallel bar support; a mounting groove is installed on the support panel; a jack is installed inside the mounting groove; one end of the mounting groove is provided with a rotating plate; one side of the mounting groove is provided with a through hole; an adjusting handle is embedded inside the through hole. According to the invention, a jack is installed inside the mounting groove, a through hole is installed at one side of the mounting groove and the adjusting handle is embedded inside the through hole; the jack can support the rotating plate and the jack can be adjusted through the adjusting handle so as to adjust the height of the rotating plate and then the rotating plate can be used as a stool for students to rest.