The invention discloses a method for corroding a PIN-type InGaAs infrared detector tabletop. The method is characterized by comprising photoetching the detector to prepare a corrosion pattern; providing a first corrosion solution having a corrosion rate between 0.98 [mu]m/min and 1.08 [mu]m/min at the temperature from 20 to 30 degree centigrade; corroding the InGaAs detector according to the corrosion pattern by using the first corrosion solution for the first time; cleaning and drying the InGaAs detector after the first-time corrosion; corroding the detector subjected to the first-time corrosion by using a second corrosion solution for the second time in order to obtain the corrosion pattern and obtain a detector with the predetermined corrosion pattern. The method provided by the presentinvention can quickly corrode the detector to achieve the predetermined pattern and the height of the tabletop, avoids frequent replacement of corrosion solution, reduces the risk, and improves the accuracy and quality of a device.