The utility model discloses a straight and even ware of well head, including lower of straight and even ware of well head hanging wall, straight and even ware of well head, lower of straight and evenware of well head connects in straight and even ware of well head hanging wall below, straight and even ware of well head hanging wall, lower of straight and even ware of well head set up endocentriccentre bore, four radial silk holes are seted up to the straight and even ware of well head hanging wall, install the jackscrew in the silk hole, and during the centre bore was stretched into to the inner of jackscrew, it is outside that radial silk hole is exposed to the outer end, exposes some installation jackscrew nuts. The piece is right in the inner installation of jackscrew. The net is prevented down to lower outer wall suit cement of straight and even ware of well head, cement is prevented placing on the net and is prevented netting uniflow rubber flapper. The utility model provides awell drilling construction unit can't independently make level to the well head, avoids appearing the ground collapse problem around the well head gauge sleeve.