The invention belongs to the field of building measurement equipment and particularly discloses an intelligent levelness detector for engineering work construction quality. The detector comprises two first pistons, second pistons, indicating lamps and a U-shaped hydraulic tube, wherein a storage battery which is used for supplying power to the indicating lamps is fixed on the hydraulic tube, hydraulic fluid is arranged in the hydraulic tube, the two first pistons are separately arranged at the two ends of the hydraulic tube in a sliding manner, the second pistons are arranged above the first pistons in a sliding manner, the indicating lamps are mounted on the second pistons, the first and second pistons are all made of permanent magnets, the first pistons and the second pistons are mutually repulsive, a trigger switch which is used for controlling the make-and-break of the indicating lamps is arranged on the sidewall of the hydraulic tube, and the trigger switch is closed when the second pistons move upwards. Compared with the traditional levelness detectors, the detector is simple in structure and accurate in measurement and can be applied to nighttime measurement.