The utility model relates to a construction is with automatic cement mortar fluidity apparatus. The pressure equipment of smashing of present fluidity apparatus is put and is accomplished by the manpower, wastes time and energy, and the dynamics that can not guarantee at every turn to smash the pressure is unanimous. The utility model discloses the constitution includes: trip gear (28), the trip gear on install and smash the pressure equipment and put (27), the pressure equipment of smashing put including backup pad (1), the one end of backup pad recess A (2) have, recess A in put motor A (3),motor A's bottom surface a set of semicircle orifice has, a set of the semicircle orifice in put ball (5), motor A be connected through motor shaft A (6) with cam A (7), the backup pad on two round holes have, connecting pipe (4) are passed the round hole with smash the piece (15) fixed connection. The utility model is used for construction is with automatic cement mortar fluidity apparatus.