A blade adjustment mechanism, configured to be applied to an air circulator comprising a housing provided with an air outlet, the air outlet comprising an air inlet side and an air outlet side, whereby the blade adjustment mechanism comprises: a fixing bracket, configured to be fixedly connected with the housing; at least two wind guide assemblies, spaced apart from each other and partially extending into the air outlet, at least one of the wind guide assemblies comprising two opposite side edges, a side edge of the wind guide assembly located at the air outlet side being rotationally connected with the fixing bracket; at least two first connecting rods, an end of one of the at least two first connecting rods being rotationally connected with a side edge of one of the at least two wind guide assemblies located at the air inlet side, extension lines of the at least two first connecting rods along length directions of the at least two first connecting rods being intersected; and a second connecting rod, fixedly connected with an end of each of the at least two first connecting rods facing away from the at least two wind guide assemblies; wherein the second connecting rod is configured to be driven to move closer to or farther away from the at least two wind guide assemblies, so as to drive the at least two first connecting rods to drive the at least two wind guide assemblies to rotate around the fixing bracket, parts of the at least two wind guide assemblies extending into the air outlet being opened or gathered relative to the air outlet to make the air outlet to blow air divergently or concentratedly, characterized in that the second connecting rod is provided with a receiving part, and the blade adjustment mechanism further comprises: an eccentric wheel assembly, comprising: a wheel, movably received in the receiving part and abuts against a side wall of the receiving part; and an adjustment rod, connected to the wheel and extending from a surface of the wheel which faces away from the receiving part; wherein the adjustment rod is configured to be driven to rotate, and the wheel abuts against the side wall of the receiving part to drive the second connecting rod to move closer to or farther away from the at least two wind guide assemblies. a fixing bracket, configured to be fixedly connected with the housing; at least two wind guide assemblies, spaced apart from each other and partially extending into the air outlet, at least one of the wind guide assemblies comprising two opposite side edges, a side edge of the wind guide assembly located at the air outlet side being rotationally connected with the fixing bracket; at least two first connecting rods, an end of one of the at least two first connecting rods being rotationally connected with a side edge of one of the at least two wind guide assemblies located at the air inlet side, extension lines of the at least two first connecting rods along length directions of the at least two first connecting rods being intersected; and a second connecting rod, fixedly connected with an end of each of the at least two first connecting rods facing away from the at least two wind guide assemblies; wherein the second connecting rod is configured to be driven to move closer to or farther away from the at least two wind guide assemblies, so as to drive the at least two first connecting rods to drive the at least two wind guide assemblies to rotate around the fixing bracket, parts of the at least two wind guide assemblies extending into the air outlet being opened or gathered relative to the air outlet to make the air outlet to blow air divergently or concentratedly, characterized in that the second connecting rod is provided with a receiving part, and the blade adjustment mechanism further comprises: an eccentric wheel assembly, comprising: a wheel, movably received in the receiving part and abuts against a side wall of the receiving part; and an adjustment rod, connected to the wheel and extending from a surface of the wheel which faces away from the receiving part; wherein the adjustment rod is configured to be driven to rotate, and the wheel abuts against the side wall of the receiving part to drive the second connecting rod to move closer to or farther away from the at least two wind guide assemblies. an eccentric wheel assembly, comprising: a wheel, movably received in the receiving part and abuts against a side wall of the receiving part; and an adjustment rod, connected to the wheel and extending from a surface of the wheel which faces away from the receiving part; wherein the adjustment rod is configured to be driven to rotate, and the wheel abuts against the side wall of the receiving part to drive the second connecting rod to move closer to or farther away from the at least two wind guide assemblies.