The utility model discloses a reliability test device of digit control machine tool elasticity chuck has overcome the problem that does not have elasticity chuck reliability test device, and reliability test device of digit control machine tool elasticity chuck includes by examination elasticity chuck fixed portion ( I ), analog loading part ( II ), fault detection part ( III ), automatic controlpart ( IV ) and ground black iron (64), wherein install on the ground black iron (64), vertically install the one side in ground black iron (64) by examination elasticity chuck fixed portion ( I ) along ground black iron (64), the opposite side in ground black iron (64) is vertically installed along ground black iron (64) to analog loading part ( II ), fault detection part ( III ) is vertically installed on ground black iron (64) by between examination elasticity chuck fixed portion ( I ) and the analog loading part ( II ) along ground black iron (64), automatic control part ( IV ) is installed on the ground of ground black iron (64) one side through wherein switch board (44).