The invention relates to a space unit for family refuge, which comprises a ceiling, a sliding door, a steel support and a central upright column, wherein a plurality of supporting beams with diagonal bracing structures are arranged in the steel support, and the bottom of the steel support is fixed on the ground; the central upright column is vertically fixed in the central position of the space unit, the top is fixed on a top cross beam of the steel support, and the ceiling and the upper part of the steel support are fixedly connected together; and the ceiling is arc shaped, and a two-way rope rotating wheel device is arranged on the central upright column. The moving space unit has the functions of firmness and crushing prevention by heavy objects by using the diagonal bracing frame, and the arc shaped ceiling capable of absorbing energy is arranged above the space to protect people in the space from being crushed. The two-way rope rotating wheel device can be driven by a motor and can be driven by gravity dual functions, people can escape disaster sites by taking a life-saving ship, and foods, water and warm keeping and gas protection objects are arranged in the space and used for temporary survival of people in disasters.