The invention provides an experimental device and method for simulating in-situ fluidized mining of deep-ground metal ore, and belongs to the technical field of deep-ground resource fluidized mining.The device comprises a reflux opening, a liquid storage tank, a liquid outlet, a pumping motor, a fluid flow meter, an electric control airtight valve, a sealing ring, a safety valve, a pressure gauge, a pressure release valve, a reaction tank top cover, an electric heating temperature control layer, a fixing bolt, a sealing washer, a reaction tank body, a liquid injection pipeline, a liquid injection hole, a porous partition plate, a liquid collection curved surface, a liquid collection bin, a pH sensor, a redox potential sensor, an ion concentration sensor, a liquid collection tank, a data centralized control visualization terminal, a temperature sensor, an oxygen concentration sensor, an air pressure sensor, an electric control temperature changer, a gas flowmeter, an O2 storage tank and a CO2 storage tank. According to the device and method of the invention, the temperature and the air pressure of the experimental device are visible and adjustable; and the pH value, the oxidation-reduction potential, the ion concentration and other parameters are measurable and controllable; and a research device and a method reference are provided for in-situ fluidized mining of the deep metalore.