The invention discloses a vertical power supply for a lamp. The vertical power supply for the lamp comprises a shell formed in an integrated mode and a tail cover, wherein one end of the shell is closed and the other end is provided with an opening; the tail cover is fixedly connected with the opening end of the shell; and a hole is formed in the tail cover. The vertical power supply for the lamp further comprises a circuit board with a control circuit, a switch for generating a pulse signal and a sealing piece, wherein at least one part of the circuit board is mounted in a cavity of the shell; one end of the switch is welded and fixed on the circuit board, and the other end of the switch is a free end; the sealing piece is mounted in the hole of the tail cover to seal the hole; and after the tail cover and the shell are fixed, the sealing piece abuts against the free end of the switch and one end of the sealing piece is exposed in the air. The vertical power supply for the lamp has the advantages of simple structure and good waterproof performance.