The invention relates to a production process of an ultrathin special-shaped aluminum alloy extruded section and a product. The process comprises the following steps: (1) preheating: the mould preheating temperature is 490-510 DEG C, the cast ingot preheating temperature is 500-520 DEG C, an extrusion barrel preheating temperature is 455-460 DEG C; (2) extrusion molding: extruding a cast ingot; (3) quenching treatment: firstly performing local online water mist treatment on the extruded aluminum alloy section at an outlet of the extrusion barrel to be set, and then performing integral online waste mist treatment, wherein the temperature of the aluminum alloy section out of a quenching region is 18-35 DEG C; (4) stretch straightening; (5) cutting off to length; and (6) artificial aging. The method provided by the invention can effectively improve the quenching quality of the ultrathin special-shaped aluminum alloy extruded section so as to guarantee the size of the section, and the prepared aluminum alloy extruded section is good in quality, regular in size and high in yield.