The invention discloses a method and device for intercepting a baseband signal. The method comprises the following steps of: performing signal processing on the baseband signal to obtain an amplitude delay profile (ADP) set; intercepting a bit where the maximum value of the energy path of the ADP set is positioned and 8-12 bits below the bit by taking the maximum value of an energy path detected by adopting a previous threshold as an intercepting parameter to obtain sampled data; or intercepting a bit where the average noise value of the ADP set is positioned and 8-12 bits above the bit by taking an average noise value detected by adopting the previous threshold as the intercepting parameter to obtain sampled data. By adopting the method and the device, the bit width of the signal can be reduced, the effect of reducing chip storage space and power consumption is achieved and the chip cost is saved. If 8 bits are intercepted from one sampled datum, storage space is saved by one time compared with the conventional way for storing two 8-bit RAMs (Random Access Memories) within 12-16 bits.