Extension type mobile operation platform applied to spacecraft assembly

The invention discloses a high-altitude extension platform. The high-altitude extension platform comprises an extension mechanism, a lifting and weight-carrying mechanism, a stand column, a base and a telescopic bottom frame, wherein the telescopic bottom frame can extend or retract at the bottom of the base; the stand column is arranged at the upper part of the base through a guide rail so as to achieve transverse translation and fine adjustment of the stand column; the lifting and weight-carrying mechanism is slidably arranged on one side of the stand column through a guide rail; the extension mechanism is arranged on the other opposite side of the stand column and is clung to the side of the interior of the lifting and weight-carrying mechanism in a manner of turning at 270 degrees; an extension pedal is also arranged on the extension mechanism; the extension pedal extends from the upper part of the extension mechanism when the extension mechanism turns to the outer side of the lifting and weight-carrying