A distributed fixed-time attitude coordination tracking control scheme is proposed based on integral sliding mode for multiple rigid spacecraft on condition of that the angular velocities of members are not available. A novel integral sliding mode is designed based on the bi-limit homogeneous technique, which achieves fixed-time convergence. A fixed-time observer is proposed to obtain an estimation of unmeasurable spacecraft information and a sliding-mode estimator is introduced to estimate the leader's attitude, which reduces the communication flow between spacecraft. By combining the fixed-time observer, the sliding mode estimator and the integral sliding mode method, a distributed fixed-time output feedback attitude coordination tracking controller is designed to guarantee that follower spacecraft simultaneously track the leader's attitude in fixed time. The fixed-time stability of the closed-loop system is ensured by employing the algebraic graph theory and Lyapunov techniques. Simulation comparison results show the effectiveness and superiority of the proposed control scheme.