本发明介绍了一种甲醇或二甲醚生产丙烯的方法,包括将二甲醚或者甲醇通入裂解反应器的二甲醚甲醇裂解区进行催化反应,二甲醚甲醇裂解区由多段床层组成;反应产物从中心管由下部导出,进入分离系统;丙烯产品移出装置,含C4烃物流循环进入C4裂解床层;含C5烃物流进入C5裂解床层; The invention introduces a method for producing propylene by using methanol or dimethyl ether. The method comprises the following steps of: passing dimethyl ether or methanol into a cracking reactor of a dimethyl ether methanol cracking region for catalytic reaction, and the dimethyl ether methanol cracking region is composed of a plurality of bed layers ; The reaction product is led from the lower part of the central pipe into the separation system; the propylene product is removed from the device and the C4 hydrocarbon stream is recycled into the C4 cracking bed; the C5 hydrocarbon-containing stream enters the C5 cracking bed;