Arm rest used for spraying concrete and provided with movable type rotary strut

The utility model discloses an arm rest used for spraying concrete and provided with a movable type rotary strut, comprising a fixing support, a hoisting and leveling assembly arm, a primary platform, a rotary strut, two sections of mechanical retractable arms and a shower nozzle assembly which are connected to a trolley in sequence, and further comprising a trolley walking chassis which is connected to the trolley. Compared with the existing like products, the arm rest disclosed by the utility model has the advantages that: 1, rapid construction can be realized under the conditions that the stability of hard rocks or surrounding rocks is better, and a soft rock tunnel can be normally and rapidly constructed; 2, problems of IV-grade and V-grade surrounding rock stage methods, particularly a rapid mechanical construction method of three stage methods, are solved, so as to support in an excavating process; the work efficiency is improved, the surrounding rock is effectively prevented from collapsing and the saf