The invention provides a concrete vibrator which comprises a supporting platform and a vibrating rod. A push handle and a lifting device are arranged on the supporting platform, the lifting device comprises a vertically arranged slide rail, a slide block is arranged in the slide rail, a rack is arranged on one side of the slide block, a transverse first cantilever plate is arranged on the other side, a vertical slot where the first cantilever plate moves up and down is formed in the side, far away from the rack, of the slide rail, the vertically arranged vibrating rod is arranged on the firstcantilever plate, the rack is engaged to a half gear, the half gear is mounted on a rotary shaft in a sleeving manner, the rotary shaft is rotatably mounted on a rotary shaft rack, the rotary shaft isdriven by a first driving device to rotate, a horizontal limiting plate is arranged at the top end of the slide rail, a sliding through hole is formed in the horizontal limiting plate, a sliding baris arranged on the top of the slide block, the upper end of the slide bar penetrates the sliding through hole, and a limiting block is arranged at the upper end of the slide bar. The vibrator can meetthe demand that the vibrator is inserted into concrete quickly and is pulled out of the concrete slowly, and meanwhile, the vibrator is relatively high in vibrating efficiency and guarantees the quality of a concrete member.