Portable high-precision positioning instrument

The utility model discloses a portable high-precision positioning instrument, which relates to the technical field of positioning instruments and comprises an upper shell, a middle shell, a lower shell, a circuit board, a waist line board, a sealing ring, a limiting groove and a limiting block. According to the utility model, the antenna is provided with the fool-proof position which is matched with the boss of the middle shell, thereby facilitating installation and identification and saving installation time; a groove is formed in the upper surface of the middle shell, so that an antenna lower surface module is effectively shielded, and signal interference is avoided; the middle shell simultaneously fixes the antenna and the circuit board, so that the increase of designed products is reduced, and the cost and the installation time are saved; the charging port is provided with a sealing ring for clamping, so that shading and water prevention can be effectively performed; the single-end stud is fixed on the mi