The invention provides a testing device and method of physical property parameters of gas in super heavy oil. The device comprises a high-temperature high-pressure sample mixing unit, a density measuring unit, a viscosity measuring unit, a sampling unit and a solubility measuring unit, wherein the high-temperature high-pressure sample mixing unit is respectively connected with the density measuring unit, viscosity measuring unit, sampling unit and solubility measuring unit; the sampling unit respectively communicates with the density measuring unit, viscosity measuring unit and solubility measuring unit; the high-temperature high-pressure sample mixing unit comprises a sample preparation appliance and a control appliance; the sample preparation appliance is provided with a feed port and a discharge port; and the control appliance comprises a heater. The invention also provides a testing method of physical property parameters of gas in super heavy oil by using the device. The device and method can perform stable testing on the solubility, density, viscosity and other parameters of gas in the super heavy oil under the high-temperature high-pressure conditions.