The invention discloses a straight-stroke support which comprises an upper flange, a lower flange, a sleeve part and a driving walking part. The driving walking part comprises a driving sleeve, a main shaft, a fixing ring, a straight walking rod and a connecting end cover. The driving sleeve and the main shaft are connected in a thread mode. The driving sleeve is made of copper. The driving sleeve is fixed in the straight walking rod through threads. The driving walking part further comprises a pressing cover, a limiting ring, a pressing ring, a driving sleeve pressing block and a thrust ball bearing. The pressing cover, the limiting ring, the pressing ring and the driving sleeve pressing block are all made of cast iron STSi5R. According to the straight-stroke support, a valve and an actuator can be effectively connected, circle rotating is converted into straight line walking, gas etching, acid etching, water erosion and oxidation can be effectively avoided, vibration and noise are low, attractiveness and safety are achieved, environment is protected, and adaptability is high.