The invention discloses a burner capable of controlling air inlet rate, comprising a shell, wherein a burner body is fixedly arranged on the inner wall of the shell; a combustion chamber is arranged at the top of the burner body; a heat exchanger is arranged at the top of the combustion chamber; a smoke collecting device is arranged at the top of the heat exchanger; an air inlet pipe is arranged at the bottom of the burner body; a fan communicates with the bottom of the air inlet pipe; an air filter is fixedly connected with the lower end of the inner wall of the air inlet pipe; the inner wallof the air inlet pipe is fixedly connected with an air baffle, a ventilation hole is formed in the top of the air baffle, and the bottom of the inner wall of the air inlet pipe is fixedly connected with limiting devices located at two sides of the air filter device. The burner provided by the invention solves the problem that the unadjustable air inlet volume is easy to cause the phenomenon of more or less gas in the burner; and the unstable operation of the burner is caused and the use effect of the burner is affected.