The invention provides a self circulation heat exchange method for materials in production of chlorinating paraffin-52 and a chlorination reaction device therefor. The method comprises the steps that: a, 
liquid paraffin is added into an automatic circulation main and auxiliary chlorination reaction kettle provided with a catalytic 
light source and a 
heat exchanger outside the kettle, and a catalytic 
light source lamp is turned on; b, 
liquid chlorine is introduced into a gasification kettle, stabilized by an accumulator still, and is introduced into a main kettle of the chlorination reaction kettle at a 
chlorine flowrate of between 200 and 230Kg / h, the chlorination temperature is controlled to be between 100 and 110 DEG C, the reaction is stopped when the 
chlorine content analyzed in a taken sample is between 50 and 54 percent to obtain a crude product of the chlorinating paraffin-52, dissolved 
chlorine and chlorine 
hydride in the crude product of the chlorinating paraffin-52 are removed by a 
degasification kettle, and then a stabilizing agent is added to obtain a finished product of the chlorinating paraffin-52; and c, gas 
coming out of the main kettle of the chlorination reaction kettle enters an auxiliary kettle of the chlorination reaction kettle, gas 
coming out of the auxiliary kettle of the chlorination reaction kettle passes through a graphitic absorber, a water falling film is used for absorbing the chlorine 
hydride in the gas to prepare 
hydrochloric acid, micro chlorine and chlorine 
hydride contained in 
tail gas which is discharged by the graphic absorber pass through a 
waste gas processor and are absorbed by water solution of 
sodium hydroxide to generate 
sodium hypochlorite and 
sodium chloride.