The invention discloses a bicycle lamp. The bicycle lamp comprises a barrel-shaped shell body and a lamp source arranged in the shell body, and the outer wall of the shell body is axially provided with a plurality of air ducts uniformly. The bicycle lamp further comprises a heat conducting rod arranged on the lamp source, a heat dissipation piece connected with the heat conducting rod, and a fixing assembly connected with the tail of the shell body, wherein the fixing assembly comprises a connection rod, a transverse rod, a first clamping piece, a second clamping piece, a screw and a nut; one end of the connection rod is in threaded connection with the tail of the shell body, and the other end of the connection rod is fixed to the top of the transverse rod in the mode that the connection rod can rotate relative to the transverse rod; the first clamping piece and the second clamping piece are fixed to the bottom of the transverse rod through the screw and the nut; and the distance between the first clamping piece and the second clamping piece can be controlled by adjusting the screwing length of the nut on the screw. The bicycle lamp can be independent from a bicycle, is convenient to replace and maintain, wide in application range and high in flexibility, and meanwhile has a good heat dissipation effect.