The invention belongs to the technical field of string mechanics, and particularly relates to an indoor experimental research apparatus for friction and torque of strings in three-dimensional curved boreholes. The indoor experimental research apparatus is used for optimizing computational models for the friction and the torque of the strings in the three-dimensional curved boreholes and improving the friction and the torque of the strings in the three-dimensional curved boreholes, is integrally divided into a driving system, a measuring system, a simulation string combination system and a fixing system and respectively comprises two servo motors, a loading lead screw, a displacement sensor, a pull pressure sensor, a torque sensor, a simulation string, a simulation shaft and the like. The front servo motor is connected with the loading lead screw by a speed reducer, and the rear servo motor is connected with a string connector by a speed reducer. The indoor experimental research apparatus has the advantages that the rigidity and the sizes of simulation string can be changed, the borehole curvature and torsion angles of the simulation shaft can be adjusted, axial and rotation movement can be generated, displacement, pull pressures and the torque can be monitored and displayed in real time, and diversified working conditions can be simulated.