Tensioning jack mounting equipment of beam yard and prestressed cable tensioning method of precast beam

The invention discloses tensioning jack mounting equipment of a beam yard and a prestressed cable tensioning method of a precast beam. The equipment comprises an electric trolley, wherein the electric trolley is provided with a positioning device and a platform plate in a liftable mode; a bearing frame comprising two stand columns arranged oppositely and a cross beam connected between the two stand columns, wherein the stand columns are vertically arranged on the platform plate, and the cross beam is provided with an electric walking trolley capable of moving in the length direction of the cross beam; a tensioning jack hung on the electric walking trolley through a height-adjustable lifting piece; a wiring mechanism comprising a pushing piece and a hanging rod which are arranged in the horizontal direction and are adjustable in length, wherein the pushing piece is installed on the lifting piece, the upper end of the hanging rod is connected to the pushing piece, and the lower end of the hanging rod is arrange