The invention discloses a slab coal consumption monitoring method of a hot continuous rolling production line. The method relates to each section in a heating furnace, instantaneous flow meters of the various sections and an instantaneous flow totalizing meter, and comprises the following steps: A, periodically acquiring numerical values of the instantaneous flow meters of the various sections and the instantaneous flow totalizing meter from the heating furnace in real time; B, calculating proportion of the instantaneous flows of the various sections according to the readings of the instantaneous flow meters, and assigning a difference value of the current reading and the reading of the instantaneous flow totalizing meter of a previous period to obtain a gas flux consumption value of each section; C, assigning a gas flow consumption value of each section of the current period according to the percentage which is obtained by dividing the unit weight of each slab of each section of the current period by the weight sum of the slab of the current slab, namely the gas consumption of each slab in the current period; D, considering the sum of gas consumption of each period after discharge of the slab as the total coal consumption of each slab. According to the method, the problem that the production cost accounting is affected due to inaccurate monitoring of the coal consumption of the existing hot continuous rolling production line can be solved.