The invention discloses a driller operating seat of a driller room of a petroleum drilling machine. The driller operating seat comprises a rotating part, a lifting part, a seat and a box body. The rotating part adopts the structure that a bearing outer ring of a turnplate is fixedly mounted on the upper surface of a seat fixing plate; a mounting cylinder is fixedly mounted at the axis position of the seat fixing plate; a plurality of diaphragm type clamping cylinders are mounted on the mounting cylinder circumferentially and uniformly; the outer circumferences of the diaphragm type clamping cylinders are contacted with a bearing inner ring of the turnplate; a rotating limiting plate is arranged on the seat fixing plate; and a convex block corresponding to the rotating limiting plate is arranged on the lower edge of the bearing inner ring of the turnplate. The driller operating seat of the driller room solves the problems that a hydraulic cylinder leaks oil during lifting, an air cylinder is locked unreliably during lifting, the upper box body of the handrail operating box cannot be fixed reliably after being opened, upper and lower box bodies are sealed unreliably, the cable trend is influenced by excessive up-and-down motion guide rods and a rotating locking mechanism is not provided in the conventional products.