The invention discloses a rotary type pressure matcher. The pressure matcher comprises an air cylinder rear end cover, an air cylinder body and an air cylinder front end cover; and the top end and thebottom end of the cylinder body are fixedly connected with the air cylinder front end cover and the air cylinder rear end cover respectively, a first through hole is formed in the center of the air cylinder body, an eccentric wheel shaft is arranged in the first through hole, a swing rotor sleeves the outside of the eccentric wheel shaft, a low-pressure air suction hole and a high-pressure air suction hole are formed in the air cylinder front end cover, the low-pressure air suction hole and the high-pressure air suction hole sequentially communicate with an air suction channel in a rotating process, and exhaust holes are formed in the side wall of the air cylinder body. The rotary type pressure matcher has the beneficial effects that the suction and mixing of low and high pressure steam is realized by changing mutual positions among the swinging rotor, the eccentric wheel shaft and the air cylinder front end cover, and compared with a jetting type pressure matcher used for achieving the same purpose, the efficiency is higher.