The invention discloses a method and a device for verifying a hot patch or a dynamic library and relates to the field of information technology. Through the method and the device, time delay for verifying a hot patch file or a dynamic library file can be shortened, and therefore user experience can be improved. The method comprises the steps that first, a code segment of a target program symbol file is acquired; second, a first verification value is calculated according to the code segment of the target program symbol file, wherein the first verification value is a verification value corresponding to a target program; third, a first file is loaded, and a second verification value is acquired, wherein the first file is the hot patch file or the dynamic library file, and the second verification value is a verification value of the hot patch file or the dynamic library file; and last, whether the first verification value and the second verification value are the same is judged, and if the first verification value and the second verification value are the same, the hot patch file or the dynamic library file is run. The method and the device are suitable for verifying the security of the hot patch file or the dynamic library file before loading the hot patch file or the dynamic library file.