The invention belongs to construction machinery in the fields of mines, tunnels, roads, water-power engineering and other rock engineering, and particularly relates to an environment-friendly multifunctional centrifugal adjustable-speed slurry spraying machine for conveying and spraying concrete. The centrifugal adjustable-speed slurry spraying machine comprises a hopper, a centrifugal rotor cavity, a stepless speed regulator, a motor, an air inlet pipe, a bottom frame, a spiral guide-out pipe, a quick-setting additive connecting pipe, a cleaning lubricating agent connecting pipe and the like, wherein the centrifugal rotor cavity consists of a centrifugal rotor, a casing and a friction baffle plate. Concrete materials enter the centrifugal rotor cavity through the hopper, the centrifugal rotor rotates through the stepless speed regulator and a shaft coupler under the motive power effect of the motor, the concrete materials contained in a cavity of the centrifugal rotor enter the spiral guide-out pipe through a discharging opening, and under the effect of compressed air, the concrete materials pass through a conveying pipeline and a spray nozzle and are ejected onto a sprayed surface at high speed to be solidified and hardened. The centrifugal adjustable-speed slurry spraying machine has the characteristics that the dust falling is realized, the environment is protected, the productivity is high, the rebounding degree is low, the application aggregate range is wide, the stepless speed regulation can be carried out, the service life is long, the maintenance quantity is small, and the like.