The invention relates to an emergency rescue vehicle and an installation method thereof, and the emergency rescue vehicle comprises a chassis (100) and an upper vehicle (200) which are relatively independent and can be connected with each other. The chassis (100) comprises a rotary base module (M1), a left hinge body module (M2), a right hinge body module (M3), a central rotary body module (M4), a rotary supporting module (M5), a left front leg module (M6), a right front leg module (M7), a left rear leg module (M8), a right rear leg module (M9), a left rear wheel module (M10), a right rear wheel module (M11) and a chassis oil cylinder module (M12) which are relatively independent and can be connected according to a preset sequence, the left front leg module (M6) comprises a left front leg and a left front wheel, and the right front leg module (M7) comprises a right front leg and a right front wheel. The chassis is divided into twelve independent small modules, water, land and air multi-path convenient transportation can be achieved, rapid and flexible delivery of the emergency rescue vehicle is achieved, and assembly and disassembly are convenient.