The invention discloses an automatic 
temperature control system for 
urea melting spraying 
granulation production, which comprises a 
melting tank and an 
electric control unit, a temperature sensor is arranged in the 
melting tank, the 
electric control unit comprises a controller for adjusting the 
heating temperature of the 
melting tank, and the 
electric control unit further comprises a temperature acquisition 
signal amplifying circuit, a feedback stability adjusting circuit and a filtering 
noise reduction circuit, the feedback stability regulation circuit is adopted to perform sampling 
feedback regulation on an output 
signal of the following amplification 
assembly, so that temperature drift imbalance in the 
signal amplification 
processing process is effectively avoided, error 
voltage is eliminated, and the self-adaptive regulation capability of the 
system is improved; the 
infrared temperature measurement sensor is adopted to collect the 
heating temperature in the melting tank, temperature collection signals are sent to the electric 
control unit to be conditioned, the defects that in the prior art, the 
time lag of a temperature sensor is high, and 
temperature control feedback is not timely are effectively overcome, temperature collection 
signal processing is accurate and effective, the precision of a 
temperature control system is high, and the system is suitable for popularization and application. And the 
production quality of 
urea melting spraying 
granulation is effectively improved.