The present invention provides a testing system for researching flow boiling heat transfer character and pressure drop character of cryogenic fluid, which belong to the technical field of cryogenic engineering and cryogenic technique. The testing system comprises a cryogenic self-pressurized storage tank, a nitrogen steel cylinder, a liquid nitrogen steel cylinder, a wide-mouth dewar, a cooling coil, an electric heating device, heat exchange equipment to be tested, a test vacuum dewar, a temperature transducer, a pressure transducer, a differential pressure transducer, a vaporizer and a gas flowmeter. The cryogenic self-pressurized storage tank is used as a pressurization device in the testing system and cryogenic fluid is outputted under a certain pressure, which can simplify the testingsystem. The heat exchange equipment to be tested is arranged in the test vacuum dewar for reducing heat loss in the testing. A vacuum valve is arranged in the test vacuum dewar and can be connected to outer high pressure nitrogen for blowing the inner part of the test vacuum dewar when necessary, which can improve the system safety. The testing system has the advantages of less land occupation, small investment, simple control, easy operation, safe, reliable and applicability to various cryogenic fluids including flammable and explosive cryogenic fluids.