Abstract: A processing method of a stainless steel vapor chamber and a vapor chamber are disclosed. The processing method of the stainless steel vapor chamber includes: connecting a stainless steel upper cover to a first copper body; immersing the first copper body, a second copper body and the stainless steel upper cover into an electrolytic solution; electrically connecting a positive electrode of a power supply to the first copper body, and electrically connecting a negative electrode of the power supply to the second copper body; starting the power supply, and electroplating a porous copper plating layer on a nickel plating layer of the stainless steel upper cover by a hydrogen bubble template method; oxidizing the stainless steel upper cover and the porous copper plating layer at a low temperature; and heating the stainless steel upper cover and the porous copper plating layer in a vacuum.