An adjustable vortex flame device comprising: a control head (10, 10d) delimiting a through hole with an opening and including a flow guiding mechanism (20, 20d), with the flow guiding mechanism (20, 20d) including a plurality of vanes (21, 21d), with the plurality of vanes (21, 21d) disposed around a circumference of the opening one after another, with two adjacent vanes (21, 21d) including a spiral air passage (22, 22d) formed therebetween, and including a flow control head (14c, 14d), with the flow control head (14c, 14d) inserting in the through hole, with the flow control head (14c, 14d) including a first member (141c, 141 d) and a second member (142c, 142d) detachably engaging with the first member (141c, 141 d) and delimiting a first chamber (1421c, 1421d), and a second chamber (1422c, 1422d) connecting to the first chamber (1421c, 1421d), with two channels (1411c, 1411d) extending in the first member (141c, 141 d) and to an outer periphery of the flow control head (14c, 14d) and connecting to the first chamber (1421c, 1421d), with the flow control head (14c, 14d) having two flow outlets defined at distal ends of the two channels (1411 c, 1411d) and a flow inlet defined at a distal end of the second chamber (1422c, 1422d), with the adjustable vortex flame device including a fuel reservoir ( 60c, 60d) fluidly connecting to the flow inlet of the flow control head (14c, 14d), with the first chamber (1421c, 1421d) extending longitudinally along a first axis, with the two channels (1411c, 1411d) disposed symmetrically with respect to the first axis, with each of the two channels (1411c, 1411 d) extending longitudinally along a second axis, and with the second axis offsetting radially from the first axis; and a hollow and transparent shield disposed above the control head (10, 10d) and delimiting a space fluidly connecting to the through hole. a control head (10, 10d) delimiting a through hole with an opening and including a flow guiding mechanism (20, 20d), with the flow guiding mechanism (20, 20d) including a plurality of vanes (21, 21d), with the plurality of vanes (21, 21d) disposed around a circumference of the opening one after another, with two adjacent vanes (21, 21d) including a spiral air passage (22, 22d) formed therebetween, and including a flow control head (14c, 14d), with the flow control head (14c, 14d) inserting in the through hole, with the flow control head (14c, 14d) including a first member (141c, 141 d) and a second member (142c, 142d) detachably engaging with the first member (141c, 141 d) and delimiting a first chamber (1421c, 1421d), and a second chamber (1422c, 1422d) connecting to the first chamber (1421c, 1421d), with two channels (1411c, 1411d) extending in the first member (141c, 141 d) and to an outer periphery of the flow control head (14c, 14d) and connecting to the first chamber (1421c, 1421d), with the flow control head (14c, 14d) having two flow outlets defined at distal ends of the two channels (1411 c, 1411d) and a flow inlet defined at a distal end of the second chamber (1422c, 1422d), with the adjustable vortex flame device including a fuel reservoir ( 60c, 60d) fluidly connecting to the flow inlet of the flow control head (14c, 14d), with the first chamber (1421c, 1421d) extending longitudinally along a first axis, with the two channels (1411c, 1411d) disposed symmetrically with respect to the first axis, with each of the two channels (1411c, 1411 d) extending longitudinally along a second axis, and with the second axis offsetting radially from the first axis; and a hollow and transparent shield disposed above the control head (10, 10d) and delimiting a space fluidly connecting to the through hole.