The invention discloses a flexible bionic robot foot which comprises a sole of the foot, a toe group, swim fins and a toe rotating mechanism, wherein the toe group comprises a front toe group and a rear toe group, the front toe group and the rear toe group are both provided with a toe mechanism, the toe mechanism comprises a support, multiple top plates and inner side movable cylinders, adjacent toe plates are hinged to each other, the innermost side toe plates are hinged to the support, and sliding blocks are arranged on the innermost side toe plates in a sliding mode respectively; one ends of the inner side movable cylinders are fixedly connected with the support, the other ends of the inner side movable cylinders are hinged to the sliding blocks respectively, and the support can be rotatably supported by the sole of the foot; adjacent toe mechanisms are connected with each other through the swim fins, and the toe rotating mechanism is arranged between the sole of the foot and the toe mechanisms, so that the support of the toe mechanisms can be driven to rotate relative to the sole of the foot. By means of the flexible bionic robot foot, a robot can walk more efficiently in the environment of soft soil and the like, and the phenomenon that due to the fact that plastic flow occurs in the soil untimely, walking of the robot is difficult due to the fact that feet of the robot sink deep is prevented.