An interlocked bottom bracket bearing device is provided, including an axial tube, two bottom bracket bearing assemblies and two annular members. The axial tube includes a first end and a second end. Each said bottom bracket bearing assembly includes a small-diameter portion and a large-diameter portion. Said two small-diameter portions are respectively assembled to the first and second ends. A side of each said large-diameter portion is radially and annularly formed with a protruding flange. Said two annular members are respectively sleeved on said two large-diameter portions. The annular members are abutted against the protruding flanges. Wherein said two bottom bracket bearing assemblies are located on two opposite sides of the bottom bracket tube, the annular member is radially clamped and a portion of the annular member is axially clamped between the protruding flange and a side wall of bottom bracket tube.