The invention provides an automatic leveling laser measurement instrument, and relates to a measurement instrument for constructional engineering, solving the problem that the existing equipment is very difficult to level and the time is consumed. The automatic leveling laser measurement instrument comprises a main engine, a rotatable bracket and a fixed bracket, wherein the rotatable bracket comprises a bowl-shaped base and a spherical rotary part; the spherical rotary part is located in the bowl-shaped base; a through hole is formed in the bottom of the bowl-shaped base; homopolar magnets are arranged on the outer surface of the spherical rotary part and the inner surface of the bowl-shaped base; a platform is arranged below the main engine; the platform is fixedly arranged on the top of the spherical rotary part by a bolt; the gravity centers of the main engine and the spherical rotary part are on the same straight line; the bottom of the spherical rotary part is further connected with a heavy hammer by a pulling rope; the pulling rope penetrates through the through hole at the bottom of the bowl-shaped base and the lower side of the bowl-shaped base is fixedly arranged on the fixed bracket; a supporting leg of the fixed bracket is a retractable rod. According to the automatic leveling laser measurement instrument, the spherical rotary part, the bowl-shaped base and the heavy hammer are additionally arranged so as to realize automatic leveling of the main engine; the flexibility of equipment is increased by adopting a magnetic levitation manner and errors caused by friction are avoided.