The invention relates to an inter-tube-bundle high-temperature high-pressure vapor-liquid two-phase flow pattern experimental device and a flow pattern identification method. An upper visualization window and a lower visualization window are symmetrically formed in the front side and the rear side of a pressure container of the experimental device; a laser generator and a high-speed video camera are arranged corresponding to the visualization windows; electric heating tubes are arranged in the pressure container; thermocouple sensors are arranged on the electric heating tubes; pressure sensors, a liquid level sensor and double-headed conductive probes are arranged on the pressure container; a flowmeter and a sheathed thermocouple are arranged at an inlet tube and an outlet tube of the pressure container; a conducting wire of an electric heating control system penetrates through the outer shell of the pressure container and is connected with the electric heating tubes; a conducting wire of a data acquisition system is connected with the measurement sensors and the high-speed video camera. The data acquisition system acquires shot images and sensor signals; a vapor-liquid two-phase flow pattern map is obtained by performing digital processing on the shot images; a quantitative relationship between fluid parameters and vapor-liquid two-phase flow patterns is established.