The invention relates to a method for continuously separating a catalyst of a synthetic fluid in a slurry bed from a product. The method comprises the following steps of: feeding a synthesis gas into a slurry bed reactor for carrying out catalytic synthesis reaction, leading obtained slurry to be subjected to the primary seperation of a 4000-6000 r/min high-speed centrifugal machine, and obtaining a light liquid component and a heavy liquid component, wherein the heavy liquid component is concentrated oil slurry being rich in more than 75% of catalyst, and the concentrated oil slurry is pressurized by using a centrifugal pump and returned to a reaction region of the slurry bed reactor to participate in reaction; heating the light liquid component to reach the temperature of 240-350 DEG C, leading the viscosity of light liquid to be less than 1mPa.S, leading the light liquid to enter into a multilayer metal sintering screen filter with the particle sizes of filtering meshes in the range of 0.5-20mum to be subjected to secondary seperation, and after seperation, treating filtrate containing the catalyst of less than 65.80mug.g as the product to be fed into a fraction seperation workshop section for deep processing; and carrying out back flushing on the sintering screen filter by using back flushing air when carrying out secondary seperation for 20-60 minutes by using the sintering screen filter so that the sintering screen filter is regenerated, and treating filter residues formed after back flushing as the waste catalyst to be processed. The method has the advantage that the catalyst of the synthetic fluid fuel in the slurry bed can be effectively and continuously separated from the product.