Three-dimensional map based on sand table

The invention discloses a three-dimensional map based on a sand table, and relates to the technical field of map display, the three-dimensional map comprises a base, electromagnets, magnetic isolation sleeves, beads and an electromagnet control module, the base is of a hollow structure, M * N electromagnets are arranged in a matrix mode of M rows and N columns to form an electromagnet matrix, and the electromagnet matrix is installed on the base; each mounting hole is sleeved with a magnetism isolating sleeve, and the magnetism isolating sleeves are magnetism isolating sleeves capable of ascending and descending; a bead is arranged at the top end of each magnetism isolating sleeve, the beads are magnetic beads, and the magnetism of the beads is opposite to the magnetism generated by the electromagnets; the electromagnet control module is connected with the electromagnet matrix, the electromagnet matrix is controlled by the electromagnet control module to generate a corresponding magnetic field, the correspond