A repeater (1) and a ranging system, the repeater (1) comprising: a bottom plate (10), a circuit board, and a main cover (20); the circuit board is mounted on the bottom plate (10), the main cover (20) covers the circuit board and is fixedly connected to the bottom plate (10), and the main cover (20) is provided with a plurality of signal interfaces (201) connected to the circuit board; each ranging device (2) is connected to one signal interface (201) by means of a signal line (70), an upper computer may connect to the signal interfaces (201) on the repeater (1) by means of several or even one data line, the repeater (1) processes signals obtained by a plurality of ranging devices (2) and transmits the processed signals to the upper computer by means of several or even one data line such that the number of interfaces on the upper computer is less than the number of ranging devices (2); the number of interfaces on the upper computer is reduced, which improves the sealing performance of the upper computer.
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