The invention discloses a foldable bicycle frame which comprises a first upper rod, a first lower rod, a second upper rod, a second lower rod, a first pivoting piece and a second pivoting piece. The first and second pivoting pieces are both provided with first pivoting holes and second pivoting holes; the first lower rod is fixed with the first pivoting piece; the second lower rod is fixed with the second pivoting piece; the first pivoting piece is pivoted with the second pivoting piece through the first pivoting holes, and the end faces of the first and second pivoting pieces respectively prop against the end parts of the second and first lower rods; one end of the first upper rod is pivoted with the upper end of a front wheel bracket and the other end is pivoted on the second pivoting hole of the second pivoting piece; and one end of the second upper rod is pivoted with a back wheel bracket and the other end is pivoted on the second pivoting hole of the first pivoting piece. The foldable bicycle frame has the advantages that the frame is convenient and quick to fold, stable in structure and convenient to take along and saves storing room.