The invention aims to provide an adjustable GIS equipment foundation concrete winter construction greenhouse and an adjusting method. The technical problem that the greenhouse can adapt to multiple different size occasions is solved. The adjustable GIS equipment foundation concrete winter construction greenhouse comprises length adjusting frame mechanisms, a width adjusting frame mechanism, lengthadjusting pushing mechanisms, a width adjusting pushing mechanism, a pneumatic mechanism and a control system; the length adjusting frame mechanisms are arranged on the two sides of the width adjusting frame mechanism; the length adjusting pushing mechanisms used for adjusting the side of the length adjusting frame mechanisms are installed on the length adjusting frame mechanisms continuously front and back; the width adjusting pushing mechanism used for adjusting the side of the width adjusting frame mechanism is installed on the width adjusting frame mechanism; and the pneumatic power output end of the pneumatic mechanism is separately connected with the length adjusting pushing mechanisms and the width adjusting pushing mechanism.