The utility model discloses a multi -functional vertical hoist and mount cat ladder, the cat ladder module of a plurality of vertical installations of butt joint from top to bottom, the cat ladder module includes square frame girder construction, the upper strata cat ladder, lower floor's cat ladder, lower floor's cat ladder footboard, a cat ladder switching footboard and an upper cat ladder supporting beam, lower floor's cat ladder footboard sets up the bottom one side in square frame girder construction, the middle part opposite side of cat ladder switching footboard setting in square frame girder construction, upper strata cat ladder supporting beam sets up that side relative up -down should in the top of square frame girder construction and lower floor's cat ladder footboard, the cat ladder swing joint of lower floor is between lower floor's cat ladder footboard and cat ladder switching footboard, upper strata cat ladder fixed connection is between a cat ladder switching footboard and an upper cat ladder supporting beam, dislocation set provides the climbing support about upper strata cat ladder and the lower floor's cat ladder in square frame girder construction.