The invention relates to a method for eliminating bubbles of a polyurethane (PU) injection moulding corner and an obtained glass window and belongs to the field of injection moulding, in particular to the field of moulding of PU reaction injection moulding coated edges. The method comprises the steps of cleaning a glass plate and coating a prime coat and is characterized in that: prior to injection moulding, an insert is glued at a peripheral corner of the glass plate; the insert is a triangular block; when positioned in a mould, an edge part of the glass plate and the insert form a corner runner with a mould cavity of the mould; and the sectional area of the corner runner containing the insert is the same as the sectional area of the runner of adjacent spaces in front of or behind the corner, or different from the sectional area by 10 percent or less. The invention has the advantages that: the method is simple in operation, the problem of bubble generation during the injection moulding of PU resins can be effectively solved, and a neat and elegant PU edge-coated glass window can be obtained.