Extension ladder for trailer machinery

The utility model belongs to the technical field of towing equipment, and discloses an extension ladder for towing machinery, which comprises a horizontally arranged slide way assembly, a platform assembly is matched on the slide way assembly, and a ladder climbing assembly is arranged at one end of the platform assembly far away from the slide way assembly; the slideway assembly comprises a left slideway and a right slideway which are correspondingly arranged; the platform assembly slides along the left slide way and the right slide way; a platform baffle is arranged at the end, away from the climbing ladder assembly, of the platform assembly. A platform left sliding rail and a platform right sliding rail are arranged on the two sides of the platform baffle correspondingly. One end, away from the slideway assembly, of the platform baffle is connected with a ladder assembly; the climbing ladder assembly comprises a climbing ladder frame connected with the platform baffle, and a climbing ladder pedal is arrang