Steel trestle construction method for non-navigable river channel

The invention provides a construction method for a steel trestle of a non-navigable river channel, which comprises the following steps: firstly, carrying out concrete pouring construction on two sides of the river channel to form buttresses, then mounting a steel pipe pile structure on a river bed through a crawler crane and a pile hammer, mounting a supporting bridge surface at the upper end of the steel pipe pile structure, and finishing the construction of a current beam section. And then the crawler crane is driven to the currently completed beam section, then the subsequent beam sections are sequentially constructed until the last beam section, and when the last beam section is constructed, only the supporting bridge surface of the last beam section needs to be installed on the steel pipe pile structure and the buttress of the last but one beam section. And then construction of the multiple beam sections from one side of the riverway to the other side of the riverway is completed, and construction of the