Legal analysis: it is not illegal to sell fire-fighting equipment after publicizing fire-fighting knowledge. Usually, the fire propaganda of enterprise units is not the staff of public security fire control organs, but the training done by outsourcing enterprises.

Legal basis: Article 56 of the Fire Protection Law of People's Republic of China (PRC), the fire control institutions of public security organs and their staff shall conduct fire control design review, fire control acceptance and fire control safety inspection in accordance with legal authority and procedures, so as to be fair, strict, civilized and efficient. Fire control institutions of public security organs and their staff shall not charge fees for fire control design review, fire control acceptance and fire control safety inspection, and shall not seek benefits by using fire control design review, fire control acceptance and fire control safety inspection. The fire control institutions of public security organs and their staff members shall not use their positions to designate brands and sales units of fire control products or fire control technical service institutions or fire control facilities construction units in disguise for users and construction units.