The invention discloses a test device for measuring the thermal expansion force of a propellant, comprising a lower fixing plate, a thermal insulation plate, a sleeve, a lower push column, a gasket, athermocouple, a strong restraint shell, a heating sleeve, an upper push column, a thermal insulation sleeve, a lower thermal insulation pad, a press column, an upper thermal insulation pad, a force sensor, an upper fixing plate, screws and nuts. The lower chamber of the strong restraint shell is provided with the sleeve and the gasket from bottom to top in sequence. The inner cavity of the sleeveis sequentially provided with the lower push column and a lower propellant from bottom to top. The thermocouple is inserted in the lower propellant through a reserved through hole. The upper chamberof the strong restraint shell is provided with an upper propellant and the upper push column from bottom to top in sequence. The outer part of the strong restraint shell is provided with a heating sleeve, and the thermal insulation sleeve tightly covers the heating sleeve and the strong restraint shell. The lower thermal insulation pad, the pressure column, the upper thermal insulation pad and thepressure sensor are sequentially arranged above the upper push column. The test device has the characteristics that the temperature and the thermal expansion force of the propellant can be accuratelymeasured, the structure is simple, and the operation is convenient.