The invention discloses a durability testing device for an explosion-proof combination switch. The durability testing device comprises a working platform, wherein a first rotating unit is arranged onthe working platform, a placement unit is arranged on the working platform, a linear electric cylinder is arranged on the working platform, a stirring unit is arranged on the linear electric cylinder,a first sliding sleeve is arranged on the stirring unit, a second rotating unit is arranged on one side of the first sliding sleeve, second sliding sleeves are arranged on the second rotating unit, asecond rectangular guide rail is arranged between the second sliding sleeves, and a clamping unit is arranged on the second rectangular guide rail. The durability of a knob of the explosion-proof combination switch can be tested by virtue of the first rotating unit, and the durability of the explosion-proof combination switch in the up-down and left-right direction can be tested by virtue of thestirring unit.