A density measurement device based on electromagnetic levitation comprises a remote observing and recording equipment, a levitation cavity and a magnetic field generating device. The levitation cavity is arranged inside the magnetic field generating device. The levitation cavity is a cylindrical measurement container and a scale is placed in the vertical direction outside the levitation cavity. The magnetic field generating device comprises a first magnet, a second magnet, a first bracket and a second bracket. The homopolar magnetic poles of the first magnet and the second magnet are placed face to face. The levitation cavity is placed between the first magnet and the second magnet and is located on the same vertical axis with the two magnets. Two sides of the first magnet and the second magnet are respectively fixedly connected with the first bracket and the second bracket through fastening screws. The remote observing and recording equipment comprises external camera shooting equipment and a computer. The functional relationship between the sample density and levitation height is built through measurement of the levitation height of the sample in electromagnetic levitation situation in the standard solution to achieve relatively accurate density of the sample.