The invention provides a test bed for verifying the function of a TBM tool changing robot, and belongs to the technical field of mechanical structure design. A reduced scale test bed needs to be ableto meet hob poses at different positions for the current mainstream structural style of a TBM tool disc and a main beam; meanwhile, available space resources in the tool disc and the front end of themain beam are considered to provide an installation interface for the later tool changing robot. Comprehensively considering the above two aspects, the reduced scale test bed is designed in two parts.The first part is a tool disc simulation part which mainly provides simulation of different hob poses; and the second part is a main beam simulation part which mainly provides space constraint of thefront end of the main beam and the interface allowing for the tool changing robot to install. Thus, the size and weight of the test bed are greatly reduced, meanwhile, different poses of hobs can besimulated at many times, and the space working ability of the robot developed in the future is tested more comprehensively. The test bed provides a method reference for laboratory level function verification of large-scale engineering equipment.