The utility model provides an oil -well cement multiviscosisty thick liquid bottom of cup lid and bottom dismounting device, oil -well cement multiviscosisty thick liquid bottom of cup lid, including a bottom main part and two bolt manner pin, seted up on the bottom surface of bottom main part two for the screw pin through -hole of bottom surface centre of a circle symmetry, the bolt manner pin with screw pin through -hole phase -match, and install in the screw pin through -hole, be used for dismantling the bottom dismounting device of oil -well cement multiviscosisty thick liquid bottom of cup lid, dismantle handle, a connecting rod and two pins including one, dismantle the handle with the middle part fixed connection of connecting rod, two pins are fixed respectively the both ends of the same side of connecting rod, these two the pin with the connecting rod vertically simultaneously with the dismantlement handle is perpendicular. Oil -well cement multiviscosisty thick liquid bottom of cup lid and bottom dismounting device, effectively solved becoming flexible easily, coming off deformation and damage and the not quick detachable problem of thick liquid bottom of cup lid even that present bottom pin exists.