The invention discloses an advanced detection device and method for unfavorable geology and rock mass mechanical properties of deep and long tunnels. The device comprises a drilling machine, a sensing system, a data conversion system and a data analysis system. The sensing system is installed on the drilling machine; the sensing system, the data conversion system and the data analysis system are connected successively; and the sensing system comprises a drill bit displacement acquisition unit, a rotation speed acquisition unit and a pressure acquisition unit. According to the advanced detection device and method, boreholes and borehole radars are combined, and a sensor technology is used for acquiring parameters of rotation speeds, drill bit displacement, torque, propulsion, impact energy, pumping pressure and the like in real time, and accordingly, rock mass physical and mechanical parameters and joint fissure distribution and occurrences in the geologic body within 30 meters ahead are forecast accurately, whether water body situations exist in a 10m range around a borehole is detected accurately, the cost is low, and the occupied construction time is short.