The invention discloses an assistant standing seat comprising a base having a positioning nest and a locating recess, a driving module installed in the positioning nest of the base, a shearing device mounted in the locating recess of the base and a seat mounted on the shearing device, wherein the shearing device has a top plate, a bottom plate pivotally mounted to a front part of the top plate, a U-shape bracket pivotally mounted to a middle part of the bottom plate and a translational device moving between the U-shape bracket and the bottom plate. With the above seat, a user's weight can be distributed to the top plate and the U-shape bracket to decrease a resistance force of the translational device when the translational device moves, and further avoid a difficult elevation of the assistant standing seat.