The utility model relates to a tightening and overload alarm integrated mechanism of a translation door, which comprises a synchronous belt assembly, a driven wheel assembly and a base which are sequentially arranged on a guide rail assembly. The tightening and overload alarm integrated mechanism is characterized in that a regulating spring assembly is arranged on the base and comprises a connecting shaft, wherein one end of the connecting shaft is fixed on the driven wheel assembly after penetrating through the base, and the other end of the connecting shaft is provided with a compression nut; a spring is sleeved on the connecting shaft between the base and the compression nut; a barrier switch is arranged on the guide rail assembly below the driven wheel assembly; a detection plate is arranged between the barrier switch and the base; and the top of the detection plate is fixed on the driven wheel assembly. The tightening and overload alarm integrated mechanism can be used for regulating a tensioning force of a synchronous belt through regulating the compression nut conveniently and rapidly; and once a barrier exists in a closing process, the spring is compressed after stressed, the synchronous belt is loosened to cause slippage and drives the detection plate to leftwards move, the barrier switch is triggered for alarming, the closing action is stopped, and the barrier switch is in a failure state without causing hurt to people.