The invention discloses a casting method of a high-speed steel roller, and belongs to the field of casting. According to the casting method, a manual pressurization manner is adopted on a dead head to enhance the feeding effect on a lower roller neck. According to the high-speed steel roller treated through the method, a bearing retainer shrinkage porosity area of the lower roller neck is remarkably shortened and is shortened to 90-100 mm from previous 300 mm, and the defect wave height of the position is also reduced to be between 10% and 15%. The physical property of the lower roller neck is also remarkably improved, and the tensile strength of the lower roller neck obtained after high-temperature heat treatment is improved to 600-650 MPa from previous 500-550 MPa.