Scraper type film evaporation dehydrator and dehydration method

The scraper type film evaporation dehydrator comprises a main machine, the main machine is cylindrical, an upper end cover of the main machine is connected with a rotary driving device, the rotary driving device is connected with a main shaft, the main shaft extends into the main machine, and an annular heating medium space is formed in the side wall of the main machine; a vacuum isolation chamber, a wax liquid distributor and a heat-resistant scraping plate are sequentially arranged in the main machine from top to bottom, the vacuum isolation chamber is connected with a vacuumizing device, a wax liquid feeding port is formed in the wax liquid distributor and connected with a wax liquid feeding pipe, the heat-resistant scraping plate is connected to the main shaft, and the heat-resistant scraping plate rotates to scrape wax liquid into a film on the inner wall of the main machine; a wax liquid storage device is arranged at the bottom of the main machine, a second heating medium space is arranged between the i