The invention discloses a suspending and releasing system used for an impact test of a lander. Only simple apparatuses such as a suspension beam, two vertical suspending belts, a hook, two inclined suspending belts and the like are used to realize suspension and release of the lander, so that the suspending and releasing system provided by the invention has the advantages of simple principle and structure and easy achievement. By arranging a suspension point switchover member, the suspension points of the whole lander shielded by a horizontal triangular board is shifted, the applied force of vertical suspending ropes is loaded on the suspension points of the whole lander indirectly after the action of a U-type suspension point switchover member, without changing the property of the applied force, so that unnecessary damage to the lander can be prevented; by adopting two protection belts, interference or damage of components such as the suspending beam and the like to the lander can be prevented after the system is released; and by connecting position-limiting ropes at two sides of the lander, swing or topple of the lander during uprising and releasing processes are prevented; and the inclined suspending belts and the vertical suspending belts are protected from being cut by a shear force.