The invention discloses an internet-based high-precision wireless intelligent building inclinometer and a measuring method thereof. The inclinometer comprises an inclination measurer used for measuring verticality of a pillar, a wireless transmission human-machine interface device and a positional corrector. The inclination measurer is in wireless communication connection with the wireless transmission human-machine interface device. The inclination measurer is mounted on the pillar through the positional corrector. The inclination measurer comprises a single-chip microcomputer, an inclination sensor, a laser emitter and an inclinometer wireless transmission device; the single-chip microcomputer is connected with the inclination sensor, the laser emitter and the inclinometer wireless transmission device; laser emitting direction of the laser emitter is parallel to a measuring reference line of the inclination sensor. The inclinometer is high in measuring accuracy and good temperature stability, allows visual display and wireless transmission, is convenient to operate and high in construction efficiency and allows in-situ adjustment of verticality of the pillar by a project department to be remotely monitored in real time.