Concrete guniting device for underground engineering and guniting method thereof

The invention belongs to the technical field of concrete guniting devices, and discloses an underground engineering concrete guniting device which comprises a machine base, an electric control box body is fixedly installed on the right side of the top of the machine base, a centrifugal mechanism is arranged on the left side of the top of the machine base, and the top of the centrifugal mechanism fixedly communicates with a funnel. A spraying pipe fixedly communicates with the bottom of the centrifugal mechanism, a separation box fixedly communicates with the top of the funnel, a supporting frame is fixedly connected to the right side of the separation box, an electric telescopic rod is fixedly mounted at the top of the left side of the supporting frame, a mounting block is fixedly connected to the bottom end of the electric telescopic rod, and a tension sensor is arranged in the mounting block; a connecting frame is fixedly connected to the bottom of the mounting block, and connecting blocks located in the se