There is disclosed a platform of an electric-movable bed for preventing bedsores and capable of changing a shaft including a plate unit. The platform includes a plurality of main plates rotatably provided to support the human body, a plurality of sub plates rotatably and hingedly coupled to the main plates, respectively, and a locking part provided between each main plate and each sub plate to enable or lock the rotation of each main plate or sub plate, the plate unit being configured to selectively rotate a corresponding portion to a position of the joint according to a user's body type; a first driving unit configured to tilt an upper part of the human body lying on the plate unit; and a second driving unit configured to tilt a lower part of the human body lying on the plate unit.