A method for detecting wear-out of tool on tunneller in tunnel-tunneling includes utilizing data collection unit on tunneller to collect various tunneling parameters; selecting out parameters including tunneling speed, total thrust, tool disc total torque and tool disc rotary speed related to tool wear-out from said tunneling parameters; using relative parameter to calculate out theoretical value of tunneling speed; judging out tool wear-out situation by analyzing deviation value between tunneling theoretical value and tunneling actual value .