The utility model relates to a structure is prevented revealing by hydraulic press exhaust head, one side of hydraulic press exhaust head is equipped with delivery port and water inlet upper and lowerly parallel, and the water inlet is connected with the experiment head, be equipped with discharge valve between delivery port and the water inlet, discharge valve includes matched with disk seat andvalve rod, and the valve rod afterbody is connected with drive arrangement, and the uide bushing reciprocating motion that can follow the exhaust head bottom at drive arrangement drive lower valve rodrealizes the valve port switching, copper sheathing and the contact of uide bushing circumference are established to the head of valve rod, and many guiding gutters are offered along the axial to theouter circumference of copper sheathing, the uide bushing is the blind hole sleeve section of thick bamboo structure of bottom lock. The utility model discloses a copper sheathing cooperates with theuide bushing, increases the abrasion resistance ability of valve rod, prolongs its replacement cycle, the uide bushing adopts blind hole sleeve section of thick bamboo structure, thoroughly stops theexhaust head and reveals the phenomenon emergence, guarantees going on smoothly of seamless steel pipe pressure testing work.