A gas burner with a function to adjust the firing angle, comprehensive:a fixed housing (1) with a left housing part (11) and a right housing part (12), with a gas storage cylinder (2) in a fixed housing (1); an upper end of one of the left housing parts (11) and the right housing part (12) cross with a rod hole (111) and at least one plug hole (112) is educated; anda rotary housing (5),the rotary joint is fixed to the fixed housing (1) and to a combustion device (6), one side of the rotary housing (5) having a first shaft hole (511) with several ring-shaped zinc slits (511(a) to accommodate a locking mechanism (53) with a locking pressure key (531), a connecting rod (531a) from an inner surface of the unlock pressure box (531) is designed to carry through the first shaft hole (511) a extendable spring (532) over this connecting rod (531a) and to carry into the rod hole (111);the connecting rod (531a) is attached to a passive element (533) in the fixed housing (1), the passive element has at least one convex zinc (533a) that is adjacent to the multiple zinc slits (511a), each of which is applied and positioned in at least one convex zinc (533a) in one of the zinc slits (511a); to form a locked status;where, when pressing the release pressure box (531), the extendable spring (532) is pressed, the passive element (533) can be moved inwards with the connecting rod (531a), which is extracted at least one convex zinc (533a) from the zinc slots (511a) to remove the locked status, the unlocking pressure box (531) serves as an axial core of the first shaft hole (511) to rotate the rotating housing (5) with the combustion device (6) directly until the desired firing angle is reached.
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