The disclosure is related to the technical field of semiconductors, and provides a method for manufacturing a tilted mesa and a method for manufacturing a detector. The method for manufacturing a tilted mesa comprises: coating a photoresist layer on a mesa region of a chip; heating the chip on which the photoresist layer is coated from a first preset temperature to a second preset temperature; performing etching processing on the heated chip, so as to manufacture a mesa having a preset tilting angle; and removing the photoresist layer on the mesa region of the chip after the mesa is manufactured.