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Electrical stimulations can promote cell growth, but most electrical stimulators could only output either voltage signals or current signals and do not output arbitrary waveforms according to need. In this paper, a wireless stimulator with adjustable stimulation signals is developed for cell culture. The original waveforms are produced by signal generating circuits. Then under the adjustment of amplification circuits, the original waveforms are converted into current stimulation signals or voltage stimulation signals. Finally, stimulation signals apply onto cells under the monitor of current measuring circuits. The stimulator can provide signals with the following characteristics: (a) required arbitrary waveforms at frequencies ranging from 0 Hz to 100kHz; (b) voltage signals at an amplitude ranging from $-$15V to 15V with a resolution of 1mV; and (c) current signals at an amplitude ranging from $-$1mA to 1mA with a resolution of 1$\mu$A when load resistance is less than 50.0k$\mathrm{\Omega }$. Results of these experiments confirm that the developed instrument can provide adjustable stimulation signals for cell growth.