A liquid motion lamp with isolated heating device has an isolated heating device disposed inside a mounting seat, including a cement resistor connecting to AC power supply and a constant current driver. The cement resistor would produce heat after being electrified and cause the flowing of the liquids in the liquid motion lamp. The constant current driver would convert the AC power into DC power for the LED bulb to project lights on the liquid motion lamp. With the isolated circuits of lights and heat as a combined composite module, the liquid motion lamp has great efficiency by distributing the sources of lights and heat, saving the energy and prolonging the durability of the LED bulb.