Steam valve testing device

The utility model relates to a steam valve testing device, which comprises a positioning block, a valve assembly and two opposite pressure heads, and is characterized in that the positioning block is used for placing a steam valve to be detected; the two opposite-pressing heads are oppositely distributed above the two ends of the positioning block, one opposite-pressing head is fixedly installed at one end of the positioning block, the interior of the opposite-pressing head is hollow, and the two ends of the opposite-pressing head are open; the valve assembly is fixedly installed at one end of one pair of pressure heads, communicated with the pair of pressure heads and used for being connected with water supply equipment and air supply equipment. The other counter-pressure head can move horizontally and be positioned to be close to or away from the positioning block, the inner portion of the counter-pressure head is hollow, one end of the counter-pressure head is open, the other end of the counter-pressure he