The present invention relates to the field of casting technology, and provides a casting mold, a differential pressure casting method and a low pressure casting method, wherein the casting mold includes an upper mold insert provided in an upper mold, and a riser cavity is provided at a lower portion of the upper mold insert, , the riser cavity and the mold cavity communicate with each other, the upper mold insert is provided with an air pipe that communicates with the riser cavity, and one end of the air pipe is located at the top of the riser cavity and can pass compressed air, and in the casting process , through the passing of compressed air in the air pipe, a pressure of the same magnitude as the mold filling pressure inside the heating furnace is formed in the upper part of the riser cavity, and in the casting solidification process, continuously forming an extrusion effect on the riser, Through the local extrusion action, the pressure of the riser is transmitted to the defect location on the fabric, and the feeding to the defect location achieves the purpose of clearing the defect.
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