The invention relates to a dehumidify device for indoor environment, comprising a membrane component, an outdoor fan, an outdoor filter, an indoor fan, an indoor filter and an air return pipeline, wherein the membrane component comprises an outer membrane component shell, an inner membrane component shell, an upper baffle, a lower baffle, hollow fiber membrane yarns and sealing glue. The central parts of the two lateral surfaces of the outer membrane component shell are provided with an air exhaust inlet and an air exhaust outlet, the upper end surface and the lower end surface are provided with a fresh air inlet and a fresh air outlet, and the upper surface and the lower surface of the inner membrane component shell are opened. The hollow fiber membrane yarns pass through the sealing glue so as to be directly packaged in the inner membrane component shell, and the upper baffle and the lower baffle are arranged in the upper cavity and the lower cavity of the outer membrane component shell. The outdoor fan is connected with the fresh air inlet through the outdoor filter, the indoor fan is connected with the air exhaust inlet through the indoor filter, and the air return pipeline is arranged between the fresh air outlet and the fresh air inlet. The invention can be independently used for dehumidifying for the indoor environment at the low-voltage of 10 kPa to 30 kPa, so the dehumidify device is the dehumidify device for the indoor environment which has a simple structure, can be conveniently operated, and has performances of energy-saving, green, environment-friendly and high efficiency.