The invention relates to a Pu'er tea pressing machine and a tea pressing method. The tea pressing steam-pressure machine comprises a portal frame, a cylinder, a non-return valve, a silencer, a tea pressing panel, a buffer pane, an adjustable die, a stress disc and a hand-operated switch. The pressing steam-pressure machine has the characteristics of fast, simple, convenient and normative operation, needing of no experience technologies, reduction of a traditional tea stone mill pressing operation, reduction of the production processing time, and reduction of the resource consumption, and a molded tea obtained after the pressing in the invention has the characteristics of normativeness, standard property, low loss and high qualified rate, so the pressing steam-pressure machine has the advantages of reduction and avoiding of human processing errors, productivity improvement, labor cost saving, and improvement of the unit time production efficiency.