The invention relates to the field of engineering machinery and discloses a suspension valve, a suspension system and an engineering vehicle. The suspension valve comprises a logic valve, a shuttle valve and a two-position four-way valve. A first oil inlet of the shuttle valve is connected with a first oil port of a first side cavity of the logic valve. A second oil inlet of the shuttle valve is connected with an energy accumulator of the suspension valve through a second oil port and a third oil port of the first side cavity of the logic valve. An oil outlet of the shuttle valve is connectedwith an oil inlet of the two-position four-way valve. A first working oil port of the two-position four-way valve is connected with a first action cavity of the two-position four-way valve. A second working oil port of the two-position four-way valve is connected with a second action cavity of the two-position four-way valve and a second side cavity of the logic valve. The suspension valve provided only needs short-time control action (for example, electricity-gaining or air source action), and rigid and flexible switching of the suspension system can be achieved, and in addition, rigid and flexible states of the suspension system are automatically maintained.