The invention relates to a trigger travel adjusting device, which comprises a cartridge receiver, a trigger and a trigger rotating shaft. The trigger is installed on the cartridge receiver through the trigger rotating shaft. Adjusting screws are installed on the trigger. A first screw installing hole is formed in a front contact position between the trigger and the cartridge receiver. One adjusting screw is installed in the first screw installing hole. A second screw installing hole is formed in a rear contact position between the trigger and the cartridge receiver. One adjusting screw is installed in the second screw installing hole. A third screw installing hole is formed between a maximum travel control hole for the trigger and the trigger. The other adjusting screw is installed in the third screw adjusting hole. The trigger travel adjusting device has the advantages that the structure is simple, the design is reasonable, the pulling of the trigger is not influenced, the travel of the trigger can be properly adjusted according to shooting habits and ages of users, the using comfort of a gun is improved, the influence of personal habits on shooting match results is minimized, the device is convenient to use, the manufacturing cost is low and the popularization and the promotion are facilitated.