A miniature high-temperature molten salt electric heating system relates to the field of engineering thermophysics and aims at meeting the measurement requirements of physical property parameters of molten salt. A heat insulation plate is fixed at the bottom of the interior of a heating furnace shell; a mullite hearth is arranged on the heat insulation plate; an opening is formed on the top of the mulllite hearth; space between the outer wall of the mullite hearth and the inner wall of the heating furnace shell is filled with high-aluminum fiber cotton; the side wall and bottom of the interior of the mullite hearth are covered with corundum linings; high-temperature resistance heating wires are embedded inside the bottom and side wall of the mullite hearth and cling to the corundum linings; a quartz vessel is fixed in the mullite hearth; a platinum crucible is put in the quartz vessel; a mullite heat insulation plate is arranged above the quartz vessel; an opening is formed in the center of the mullite heat insulation plate; the detection end of a thermocouple is connected to the quartz vessel; the temperature output end of the thermocouple is connected to the input end of the temperature controller; and the temperature controller is used for controlling the temperature of the high-temperature resistance heating wires. The miniature high-temperature molten salt electric heating system is capable of heating molten salt to a relatively high temperature, high in accuracy of temperature control and suitable for heating the molten salt.