The embodiment of the invention provides a code loop discriminator and a short multipath restraining method. The code loop discriminator includes a carrier stripping arithmetic unit, a pseudo code generator, a pseudo code loop filter, a pseudo code phase discriminator, ten integral zero clearing devices and ten convolution arithmetic units; the input end of each convolution arithmetic unit in the ten convolution arithmetic units is connected with the output end of the carrier stripping arithmetic unit and the output end of the pseudo code generator; the output ends of the ten convolution arithmetic units are in one-to-one corresponding connection with the input ends of the ten integral zero clearing devices; the output ends of the ten integral zero clearing devices are connected with the input ends of the pseudo code phase discriminator; the output end of the pseudo code phase discriminator is connected with the input end of the pseudo code loop filter; and the output end of the pseudo code loop filter is connected with the pseudo code generator. With the code loop discriminator and the short multipath restraining method of the invention adopted, code phase tracking can be accurately performed on short multipath signals, and therefore, a short multipath effect can be effectively restrained, and high-precision indoor positioning services can be obtained.